lesson 7 homework practice surface area of pyramids answer key

Surface Area - Pyramids

Examples, videos, and solutions to help Grade 7 students learn how to find the surface area of three-dimensional objects whose surface area is composed of triangles and quadrilaterals, specifically focusing on pyramids.

New York State Common Core Math Grade 7, Module 3, Lesson 22

Lesson 22 student outcomes.

• Students find the surface area of three-dimensional objects whose surface area is composed of triangles and quadrilaterals, specifically focusing on pyramids. They use polyhedron nets to understand that surface area is simply the sum of the area of the lateral faces and the area of the base(s).

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Explanation:

Find the surface area of each prism.

The volume of the prism shown below is 140 cubic meters. Find the height of the prism.

The volume of the prism shown below is 10,360 cubic feet. Find the width of the prism.

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Go Math Grade 6 Answer Key Chapter 11 Surface Area and Volume

Go Math Grade 6 Answer Key Chapter 11 Surface Area and Volume contains 6th Standard Go Math solutions which will make students understand the concepts easily help the students to score well in the exams. This Go Math Grade 6 Answer Key Chapter 11 Surface Area and Volume. And in this, each and every question was explained intimately . The answers in this chapter are explained in a simple way that anyone can understand easily.

This chapter 11 contains Three-Dimensional Figures and Nets, Explore Surface Area Using Nets, Surface Area of Prisms, etc. are explained clearly which makes the scholars learn quickly. Go Math Grade 6 Answer Key Chapter 11 Surface Area and Volume. questions are explained in a basic way that students will never feel any difficulty in learning. By this, students can gain good knowledge and this is helpful in finish student’s assignments also.

Lesson 1: Three-Dimensional Figures and Nets

Share and Show – Page No. 599

Problem solving + applications – page no. 600, three-dimensional figures and nets – page no. 601, lesson check – page no. 602.

Lesson 2: Investigate • Explore Surface Area Using Nets

Share and Show – Page No. 605

What’s the error – page no. 606, explore surface area using nets – page no. 607, lesson check – page no. 608.

Lesson 3: Algebra • Surface Area of Prisms

Share and Show – Page No. 611

Unlock the problem – page no. 612, surface area of prisms – page no. 613, lesson check – page no. 614.

Lesson 4: Algebra • Surface Area of Pyramids

Share and Show – Page No. 617

Problem solving + applications – page no. 618, surface area of pyramids – page no. 619, lesson check – page no. 620.

 Mid-Chapter Checkpoint

Mid-Chapter Checkpoint – Vocabulary – Page No. 621

Page no. 622.

Lesson 5: Investigate • Fractions and Volume

Share and Show – Page No. 625

Problem solving + applications – page no. 626, fractions and volume – page no. 627, lesson check – page no. 628.

Lesson 6: Algebra • Volume of Rectangular Prisms

Share and Show – Page No. 631

Aquariums – page no. 632, volume of rectangular prisms – page no. 633, lesson check – page no. 634.

Lesson 7: Problem Solving • Geometric Measurements

Share and Show – Page No. 637

On your own – page no. 638, problem solving geometric measurements – page no. 639, lesson check – page no. 640.

Chapter 11 Review/Test

Chapter 11 Review/Test – Page No. 641

Page no. 642, page no. 643, page no. 644, page no. 645, page no. 646.

Identify and draw a net for the solid figure.

Answer: The base Square or Rectangle, and lateral faces are Triangle and the figure is a Square pyramid or Rectangular pyramid.

Explanation: The base is a square or rectangle and lateral faces are squares are rectangle. The figure is a Cube or Rectangular prism.

Identify and sketch the solid figure that could be formed by the net.

Answer: Triangular pyramid.

Explanation: The net has four triangles, so it is a triangular pyramid.

On Your Own

Answer: Triangular prism.

Explanation: The base is a rectangle and the lateral faces are triangles and rectangles, so it is a triangular prism.

Answer:  Rectangular Prism.

Explanation: The base is a rectangle and the lateral faces are squares and rectangles. And it is a Rectangular prism.

Explanation: The shape of the galena is Cube.

Answer: No, she cannot fold her net into a cube. Rhianon’s net has seven squares but there are only six squares in the net of a cube.

Answer: We can see that Diamond crystal consists of two square pyramids with congruent bases and the pyramids are reversed and placed base to base.

Explore Surface Area Using Nets Question 10. Sasha makes a triangular prism from paper. The bases are _____. The lateral faces are _____.

Answer: The bases are Triangle The lateral faces are Rectangle

Answer: Rectangular Prism

Answer: Cube, Rectangular prism

Answer: Square Pyramid

Answer: Triangular Prism

Problem Solving

Question 5. Hobie’s Candies are sold in triangular pyramid-shaped boxes. How many triangles are needed to make one box?

Question 6. Nina used plastic rectangles to make 6 rectangular prisms. How many rectangles did she use?

Question 7. Describe how you could draw more than one net to represent the same three-dimensional figure. Give examples.

Explanation:

Question 1. How many vertices does a square pyramid have?

Question 2. Each box of Fred’s Fudge is constructed from 2 triangles and 3 rectangles. What is the shape of each box?

Spiral Review

Question 3. Bryan jogged the same distance each day for 7 days. He ran a total of 22.4 miles. The equation 7d = 22.4 can be used to find the distance d in miles he jogged each day. How far did Bryan jog each day?

Answer: 3.2 miles

Explanation: As given in equation 7d= 22.4, d= 22.4÷7 = 3.2 miles.

Question 4. A hot-air balloon is at an altitude of 240 feet. The balloon descends 30 feet per minute. What equation gives the altitude y, in feet, of the hot-air balloon after x minutes?

Answer: Y= 240- 30X.

Explanation: Given altitude Y, and the ballon was descended 30 feet per minute. So the equation is Y= 240- 30X.

Go Math Grade 6 Chapter 11 Answer Key Pdf Question 5. A regular heptagon has sides measuring 26 mm and is divided into 7 congruent triangles. Each triangle has a height of 27 mm. What is the area of the heptagon?

Answer: 351 mm 2

Explanation: Area of heptagon= 1/2 b×h = 1/2 (26)×(27) = 13×27 = 351 mm 2

Question 6. Alexis draws quadrilateral STUV with vertices S(1, 3), T(2, 2), U(2, –3), and V(1, –2). What name best classifies the quadrilateral?

Answer: Parallelogram

Use the net to find the surface area of the prism.

Explanation: First we must find the area of each face A= 4×3= 12 B= 4×3= 12 C= 5×4= 20 D= 5×4= 20 E= 5×3= 15 F= 5×3= 15 So, the surface area is 12+12+20+20+15+15= 94 cm 2

Find the surface area of the rectangular prism.

Answer: 222 cm 2

Explanation: Area of a rectangular prism is 2(wl+hl+hw) = 2(7×9+ 3×9+ 3×7) = 2(63+27+21) = 2(111) = 222 cm 2

Explanation: Area of a rectangular prism is 2(wl+hl+hw) = 2(10×10+ 10×10+ 10×10) = 2(100+100+100) = 2(300) = 600 cm 2

Answer: 350 cm 2

Explanation: Area of a rectangular prism is 2(wl+hl+hw) = 2(15×5+ 5×5+ 15×5) = 2(75+25+75) = 2(175) = 350 cm 2

Problem Solving + Applications

Question 5. A cereal box is shaped like a rectangular prism. The box is 20 cm long by 5 cm wide by 30 cm high. What is the surface area of the cereal box?

Answer: 1700 cm 2

Explanation: The length of the box is 20 cm, the wide is 5 cm and the height is 30 cm. So surface area of the cereal box is 2(wl+hl+hw)= 2(20×5+30×20+30×5) = 2(100+600+150) = 2(850) = 1700 cm 2

Question 6. Darren is painting a wooden block as part of his art project. The block is a rectangular prism that is 12 cm long by 9 cm wide by 5 cm high. Describe the rectangles that make up the net for the prism.

Question 7. In Exercise 6, what is the surface area, in square meters, that Darren has to paint?

Answer: 416 cm 2

Explanation: Surface area = 2(wl+hl+hw) = 2(9×12+5×12+ 5×9) = 2(108+60+45) = 2(213) = 416 cm 2

Answer: Emilio drew the net incorrectly Face D and F should have been 2 cm by 5 cm, not 3 cm by 5 cm

Explanation: Face A: 3×2= 6 cm 2 Face B: 3×5= 15 cm 2 Face C: 3×2= 6 cm 2 Face D: 2×5= 10 cm 2 Face E: 3×5= 15 cm 2 Face F: 2×5= 10 cm 2 So, the surface area of the prism area is 6+15+6+10+15+10= 62 cm 2.

9a. The area of face A is 10 cm 2 .

Answer: True

Explanation: The area of face A is 2×5= 10 cm 2 .

9b. The area of face B is 10 cm 2 .

Answer: False

Explanation: The area of face B is 2×8= 16  cm 2 .

9c. The area of face C is 40 cm 2 .

Answer: The area of face C is 8×5= 40 cm 2 .

9d. The surface area of the prism is 66 cm 2 .

Answer: 160 cm 2 .

Explanation: The surface area of the prism is = 2×10+2×10+2×40 = 20+20+80 = 160 cm 2 .

Use the net to find the surface area of the rectangular prism.

Answer: 52 square units.

Explanation: The area of face A is 6 squares. The area of face B is 8 squares. The area of face C is 6 squares. The area of face D is 12 squares. The area of face E is 8 squares. The area of face F is 12 squares. The surface area is 6+8+6+12+8+12= 52 square units.

Answer: 112 square units.

Explanation: The area of face A is 16 squares. The area of face B is 8 squares. The area of face C is 32 squares. The area of face D is 16 squares. The area of face E is 32 squares. The area of face F is 8 squares. The surface area is 112 square units.

Answer: 102 mm 2

Explanation: Area= 2(wl+hl+hw) = 2(3×7+3×7+3×3) = 2(21+21+9) = 2(51) = 102 mm 2

Answer: 58 in. 2

Explanation: Area= 2(wl+hl+hw) = 2(5×1+ 4×1+ 4×5) = 2(5+4+20) = 2(29) = 58 in. 2

Answer: 77 ft 2

Explanation: Area= 2(wl+hl+hw) = 2(6.5×2+3×2+3×6.5) = 2(13+6+19.5) = 2(38.5) = 77 ft 2

Question 6. Jeremiah is covering a cereal box with fabric for a school project. If the box is 6 inches long by 2 inches wide by 14 inches high, how much surface area does Jeremiah have to cover? _______ in. 2

Answer: 248 in. 2

Go Math Grade 6 Answer Key Chapter 11 Question 7. Tia is making a case for her calculator. It is a rectangular prism that will be 3.5 inches long by 1 inch wide by 10 inches high. How much material (surface area) will she need to make the case? _______ in. 2

Answer: 97 in. 2

Explanation: Surface Area= 2(wl+hl+hw) = 2(1×3.5+ 10×3.5+ 10×1) = 2(3.5+35+10) = 2(48.5) = 97 in. 2

Question 8. Explain in your own words how to find the surface area of a rectangular prism.

Answer: To find the surface area we must know the width, length, and height of the prism and then we can apply the formula which is Surface area= 2(width ×length)+ 2(length×height)+ 2(height×width) = 2(width ×length+ length×height+ 2(height×width)

Question 1. Gabriela drew a net of a rectangular prism on centimeter grid paper. If the prism is 7 cm long by 10 cm wide by 8 cm high, how many grid squares does the net cover? _______ cm 2

Answer: 412 cm 2.

Explanation: Surface area is 2(wl+hl+hw) = 2(10×7+8×7+8×10) = 2(70+56+80) = 2(206) = 412 cm 2.

Question 2. Ben bought a cell phone that came in a box shaped like a rectangular prism. The box is 5 inches long by 3 inches wide by 2 inches high. What is the surface area of the box? _______ in. 2

Answer: 62 in. 2

Explanation: Surface area is 2(wl+hl+hw) = 2(3×5+2×5+2×3) = 2(15+10+6) = 2(31) = 62 in. 2

Question 3. Katrin wrote the inequality x + 56 < 533. What is the solution of the inequality?

Answer: X<477.

Explanation: X+56<533 = X<533-56 = X<477.

Answer: y= 5x

Explanation: y/x = 10/2= 15/4= 3 y= 5x The pattern is y is x multiplied by 5.

Question 5. A square measuring 9 inches by 9 inches is cut from a corner of a square measuring 15 inches by 15 inches. What is the area of the L-shaped figure that is formed? _______ in. 2

Answer: 144 in. 2

Explanation: The area of a square A= a 2 , so we will find the area of each square. Area= 9 2 = 9×9 = 81 in. 2 And the area of another square is A= 15 2 = 15×15 = 225 in. 2 So the area of L shaped figure is 225-81= 144 in. 2

Question 6. Boxes of Clancy’s Energy Bars are rectangular prisms. How many lateral faces does each box have?

Explanation: As Lateral faces are not included in the bases, so rectangular prism has 4.

Use a net to find the surface area.

Answer: 24 ft 2

Explanation: The area of each face is 2 ft×2 ft= 4 ft and the number of faces is 6, so surface area is 6×4= 24 ft 2

Answer: 432 cm 2

Explanation: The area of face A is 16×6= 96 cm 2 The area of face B is 16×8= 128 cm 2 The area of face C and D is 1/2 × 6×8= 24 cm 2 The area of face E is 16×10= 160 cm 2 The surface 96+128+2×24+160= 432 cm 2

Answer: 155.5 in. 2

The area of each face is 7 1/2 × 7 1/2 = 15/2 × 15/2 = 225/4 in. 2 The number of faces is 6 and the surface area is 6× 225/4 = 675/4 = 337 1/2 in. 2

Go Math 6th Grade Chapter 11 Mid Chapter Checkpoint Answer Key Question 6. Attend to Precision Calculate the surface area of the cube in Exercise 5 using the formula S = 6s 2 . Show your work.

Answer: 337 1/2 in. 2

Explanation: As S= s 2 = 6(7 1/2) 2 = 6(15/2) 2 = 6(225/4) = 675/2 = 337 1/2 in. 2

Question 7. The Vehicle Assembly Building at Kennedy Space Center is a rectangular prism. It is 218 m long, 158 m wide, and 160 m tall. There are four 139 m tall doors in the building, averaging 29 m in width. What is the building’s outside surface area when the doors are open? a. Draw each face of the building, not including the floor.

Question 7. b. What are the dimensions of the 4 walls?

Answer: The 2 walls measure 218 m ×160 m and 2 walls measure by 158 m×160 m.

Question 7. c. What are the dimensions of the roof?

Answer: The dimensions of the roof are 218 m×158 m.

Question 7. d. Find the building’s surface area (not including the floor) when the doors are closed. _______ m 2

Answer: 1,54,764 m 2

Explanation: The area of two walls is 218×160= 34,880 m 2 The area of the other two walls is 158×160= 25,280 m 2 The area of the roof 158×218= 34,444 m 2 The surface area is 2× 34,880+ 2× 25,280+ 34,444 = 69,760+ 50,560+ 34,444 = 1,54,764 m 2

Question 7. e. Find the area of the four doors. _______ m 2

Answer: 16,124 m 2

Explanation: Area of a door is 139×29 = 4031 m 2 And the area of 4 doors is 4×4031= 16,124 m 2

Question 7. f. Find the building’s surface area (not including the floor) when the doors are open. _______ m 2

Answer: 1,38,640 m 2

Explanation: The building’s surface area (not including the floor) when the doors are open is 1,54,764 – 16,124= 1,38,640 m 2

Go Math Lesson 11.3 Surface Area and Volume Question 8. A rectangular prism is 1 \(\frac{1}{2}\) ft long, \(\frac{2}{3}\) ft wide, and \(\frac{5}{6}\) ft high. What is the surface area of the prism in square inches? _______ in. 2

Answer: 808 in. 2

Explanation: The area of two faces is 1 1/2× 5/6 = 3/2 × 5/6 = 5/4 cm 2 The area of two faces is 2/3 × 5/6 = 5/9 ft 2 The area of two faces is 1 1/2× 2/3 = 3/2 × 2/3 = 1 ft 2 The surface area of the prism is 2(wl+hl+hw) = 2(5/4 + 5/9 + 1) = 2( 1.25+0.55+1) = 2.5+1.1+2 = 5.61 ft 2 As 1 square foot = 144 square inches so 5.61×144 = 807.84 = 808 in. 2

Question 9. A gift box is a rectangular prism. The box measures 8 inches by 10 inches by 3 inches. What is its surface area? _______ in. 2

Answer: 268 in. 2

Explanation: The area of face A and Face E is 8×10= 80 in. 2 The area of face B and Face F is 8×3= 24 in. 2 The area of face C and Face D is 10×3= 30 in. 2 The surface area is 2×80+2×24+2×30 = 160+48+60 = 268 in. 2

Answer: 104 cm 2

Explanation: Surface area= 2(wl+hl+hw) = 2(6×5+2×5+2×6) = 2(30+10+12) = 2(52) = 104 cm 2

Answer: 118 in. 2

Explanation: Surface area= 2(wl+hl+hw) = 2(3.5×4+6×4+6×3.5) = 2(59) = 118 in. 2

Answer: 486 ft 2

Explanation: Surface area= 2(wl+hl+hw) = 2(9×9+9×9+9×9) = 2(81+81+81) = 2(243) = 486 ft 2

Answer: 336 cm 2.

Explanation: Area = 1/2 bh = 1/2 (6)(8) = 3×8 = 24. As there are 2 triangles, so 2×24= 48. Surface Area= (wl+hl+hw) = (6×12+8×12+12×10) = 228 Total Surface area = 228+48 = 336 cm 2

Question 5. A shoe box measures 15 in. by 7 in. by 4 \(\frac{1}{2}\) in. What is the surface area of the box? _______ in. 2

Answer: 408 in. 2

Explanation: The area of two faces is 15×7= 105 in. 2 The area of two faces is 15× 4 1/2 = 15 × 9/2 = 15 × 4.5 = 67.5 in. 2 The area of two faces is 7× 4 1/2 = 7× 9/2 = 7× 4.5 = 31.5 in. 2 The surface area is 2×105+ 2×67.5+ 2×31.5 = 210+ 135+ 63 = 408 in. 2

Mathematics Grade 6 Unit 11 Area and Volume Answers Question 6. Vivian is working with a styrofoam cube for art class. The length of one side is 5 inches. How much surface area does Vivian have to work with? _______ in. 2

Answer: 150 in. 2

Explanation: The area of each face is 5×5= 25 in. 2 The number of faces that styrofoam cube has is 6 So the surface area is 6×25= 150 in. 2

Question 7. Explain why a two-dimensional net is useful for finding the surface area of a three-dimensional figure.

Answer: Two-dimensional net is useful because by using a two-dimensional net you can calculate the surface area of each face and add them up to find the surface area of the three-dimensional figure.

Question 1. What is the surface area of a cubic box that contains a baseball that has a diameter of 3 inches? _______ in. 2

Answer: 54 in. 2

Explanation: The area of each face is 3×3= 9 in. 2 The number of faces for a cubic box is 6 in. 2 The surface area of box that contains a baseball is 6×9= 54 in. 2

Question 2. A piece of wood used for construction is 2 inches by 4 inches by 24 inches. What is the surface area of the wood? _______ in. 2

Answer: 304 in. 2

Explanation: The area of two faces is 4×2= 8 in. 2 The area of two faces is 2×24= 48 in. 2 The area of two faces is 24×4= 96 in. 2 So the surface area is 2×8+ 2×48+ 2×96 = 16+96+192 = 304 in. 2

Question 3. Detergent costs $4 per box. Kendra graphs the equation that gives the cost y of buying x boxes of detergent. What is the equation?

Answer: Y= 4X.

Explanation: The total price Y and the price is equal to 4 × X, and X is the number of boxes that Kendra buys. So the equation is Y=4X.

Question 4. A trapezoid with bases that measure 8 inches and 11 inches has a height of 3 inches. What is the area of the trapezoid? _______ in. 2

Answer: 28.5 in. 2

Explanation: Area of a trapezoid is 1/2(b1+b2)h = 1/2(8+11)3 = 1/2(19)3 = 1/2 (57) = 28.5 in. 2

Question 5. City Park is a right triangle with a base of 40 yd and a height of 25 yd. On a map, the park has a base of 40 in. and a height of 25 in. What is the ratio of the area of the triangle on the map to the area of City Park?

Answer: 1296:1.

Explanation: Area= 1/2 bh = 1/2 (40)(25) = (20)(25) = 500 yd 2 So area of city park is 500 yd 2 Area= 1/2 bh = 1/2 (40)(25) = (20)(25) = 500 in 2 So area on the map is 500 in as 1 yd 2 = 1296 in 2 So 500 in 2 = 500×1296 = 648,000 So, the ratio of the area of the triangle on the map to the area of City Park is 648,000:500 = 1296:1.

Explanation: The area of two faces is 18 squares The area of two faces is 6 squares The area of two faces is 12 squares So the surface area is 2×18+ 2×6+ 2×12 = 72 square units.

Answer: 105 cm 2

Question 2. A triangular pyramid has a base with an area of 43 cm 2 and lateral faces with bases of 10 cm and heights of 8.6 cm. What is the surface area of the pyramid? _______ cm 2

Answer: 172 cm 2

Explanation: The area of one face is 1/2×10×8.6 = 5×8.6 = 43 cm 2 The surface area of the pyramid is 43+3×43 = 43+ 129 = 172 cm 2

Surface Area and Volume Test Answer Key Question 3. A square pyramid has a base with a side length of 3 ft and lateral faces with heights of 2 ft. What is the lateral area of the pyramid? _______ ft 2

Answer: 12 ft 2

Explanation: The area of one face is 1/2×3×2= 3 ft 2 The lateral area of the pyramid is 4×3= 12 ft 2

Use a net to find the surface area of the square pyramid.

Answer: 208 ft 2

Answer: 220 cm 2

Answer: 264 in. 2

Question 7. The Pyramid Arena is located in Memphis, Tennessee. It is in the shape of a square pyramid, and the lateral faces are made almost completely of glass. The base has a side length of about 600 ft and the lateral faces have a height of about 440 ft. What is the total area of the glass in the Pyramid Arena? _______ ft 2

Answer: 5,28,000 ft 2

Explanation: The area of one face is 1/2×600×440= 1,32,000 ft 2 The surface of tha lateral faces is 4× 1,32,000= 5,28,000 ft 2 So, the total area of the glass in the arena is 5,28,000 ft 2

Question 8. The Great Pyramids are located near Cairo, Egypt. They are all square pyramids, and their dimensions are shown in the table. What is the lateral area of the Pyramid of Cheops? _______ m 2

Answer: 82,800 m 2

Explanation: The area of one face is 1/2×230×180 = 230×90 = 20,700 m 2 The lateral area of the pyramid of Cheops is 4×20,700= 82,800 m 2

Question 9. What is the difference between the surface areas of the Pyramid of Khafre and the Pyramid of Menkaure? _______ m 2

Answer: 93,338 m 2

Explanation: The area of the base is 215×215= 46,225 The area of one face is 1/2×215×174 = 215× 87 18,705 m 2 The surface area of Pyramid Khafre is 46,225+4×18,705 = 46,225+ 74820 = 121,045 m 2 The area of the base 103×103= 10,609 The area of one face is 1/2×103×83 = 8549÷2 = 4274.4 m 2 The surface area of the Pyramid of Menkaure is 10,609+4×4274.5 = 10,609+ 17,098 = 27,707 m 2

The difference between the surface areas of the Pyramid of Khafre and the Pyramid of Menkaure = 121,405-27,707 = 93,338 m 2

Answer: 6x+9 ft 2.

Explanation: The expression for the surface area of the square pyramid is 6x+9 ft 2.

Question 11. Make Arguments A square pyramid has a base with a side length of 4 cm and triangular faces with a height of 7 cm. Esther calculated the surface area as (4 × 4) + 4(4 × 7) = 128 cm 2 . Explain Esther’s error and find the correct surface area

Answer: 72 cm 2 .

Explanation: Esther didn’t apply the formula correctly, she forgot to include 1/2 in the calculated surface area. The correct surface area is (4×4)+4(1/2 ×4×7) = 16+4(14) = 16+56 = 72 cm 2 .

Answer: 160 in. 2

Explanation: No, I disagree with Jose as he found surface area instead of the lateral area, so the lateral area is 4×1/2×10×8 = 2×10×8 = 160 in. 2

Answer: 95 mm 2

Answer: 612 cm 2

The area of the base is 18×18= 324 cm 2 The area of one face is 1/2×18×8 = 18×4 =  72 cm 2 The surface area is 324+4×72 = 25+4×17.5 = 25+70 = 612 cm 2

Answer: 51.25 yd 2

The area of the base is 2.5×2.5= 6.25  mm 2 The area of one face is 1/2×2.5×9 = 22.5/2 = 11.25 yd 2 The surface area is 25+4×17.5 = 6.25+4×11.25 = 6.25+45 = 51.25 yd 2

Answer: 180 in 2

The area of the base is 10×10= 100 in 2 The area of one face is 1/2×4×10 = 2×10 = 20 in 2 The surface area is 100+4×20 = 100+4×20 = 100+80 = 180 in 2

Question 5. Cho is building a sandcastle in the shape of a triangular pyramid. The area of the base is 7 square feet. Each side of the base has a length of 4 feet and the height of each face is 2 feet. What is the surface area of the pyramid? _______ ft 2

Answer: 19 ft 2

Explanation: The area of one face is 1/2×4×2= 4 ft 2 The surface area of the triangular pyramid is 7+3×4 = 7+12 = 19 ft 2

Question 6. The top of a skyscraper is shaped like a square pyramid. Each side of the base has a length of 60 meters and the height of each triangle is 20 meters. What is the lateral area of the pyramid? _______ m 2

Answer: 2400 m 2

Explanation: The area of one face is 1/2×60×20 = 600 m 2 The lateral area of the pyramid is 4×600= 2400 m 2

Question 7. Write and solve a problem finding the lateral area of an object shaped like a square pyramid.

Answer: Mary has a triangular pyramid with a base of 10cm and a height of 15cm. What is the lateral area of the pyramid?

Explanation: The area of one face is 1/2×10×15 = 5×15 = 75 cm 2 The lateral area of the triangular pyramid is 3×75 = 225 cm 2

Question 1. A square pyramid has a base with a side length of 12 in. Each face has a height of 7 in. What is the surface area of the pyramid? _______ in. 2

Answer: 312 in. 2

Explanation: The area of the base is 12×12= 144 in. 2 The area of one face is 1/2×12×7 = 6×7 = 42 in. 2 The surface area of the square pyramid is 144+4×42 = 144+ 168 = 312 in. 2

Question 2. The faces of a triangular pyramid have a base of 5 cm and a height of 11 cm. What is the lateral area of the pyramid? _______ cm 2

Answer: 82.5 cm 2

Explanation: The area of one face is 1/2×5×11 = 55/2 = 27.5 cm 2 The lateral area of the triangular pyramid is 3×27.5= 82.5 cm 2

Answer: y=x+1.

Explanation: As the figure represents that every y value is 1 more than the corresponding x value, so the linear equation is y=x+1.

Question 4. A regular octagon has sides measuring about 4 cm. If the octagon is divided into 8 congruent triangles, each has a height of 5 cm. What is the area of the octagon? _______ cm 2

Explanation: Area is 1/2bh = 1/2× 4×5 = 2×5 = 10 cm 2 So the area of each triangle is 10 cm 2 and the area of the octagon is 8×10= 80 cm 2

Question 5. Carly draws quadrilateral JKLM with vertices J(−3, 3), K(3, 3), L(2, −1), and M(−2, −1). What is the best way to classify the quadrilateral?

Answer: It is a Trapezoid.

Surface Area and Volume Answer Key Question 6. A rectangular prism has the dimensions of 8 feet by 3 feet by 5 feet. What is the surface area of the prism? _______ ft 2

Answer: 158 ft 2

Explanation: The area of the two faces of the rectangular prism is 8×3= 24 ft 2 The area of the two faces of the rectangular prism is 8×5= 40 ft 2 The area of the two faces of the rectangular prism is 3×5= 15 ft 2 The surface area of the rectangular prism is 2×24+2×40+2×15 = 48+80+30 = 158 ft 2

Question 1. _____ is the sum of the areas of all the faces, or surfaces, of a solid figure.

Answer: Surface area is the sum of the areas of all the faces, or surfaces, of a solid figure.

Question 2. A three-dimensional figure having length, width, and height is called a(n) _____.

Answer: A three-dimensional figure having length, width, and height is called a(n) solid figure.

Question 3. The _____ of a solid figure is the sum of the areas of its lateral faces.

Answer: The lateral area of a solid figure is the sum of the areas of its lateral faces.

Concepts and Skills

Answer: Triangular prism

Answer: 216 in. 2

Answer: 310 cm 2

Question 7. A machine cuts nets from flat pieces of cardboard. The nets can be folded into triangular pyramids and used as pieces in a board game. What shapes appear in the net? How many of each shape are there?

Answer: 4 triangles.

Explanation: There are 4 triangles.

Question 8. Fran’s filing cabinet is 6 feet tall, 1 \(\frac{1}{3}\) feet wide, and 3 feet deep. She plans to paint all sides except the bottom of the cabinet. Find the area of the sides she intends to paint. _______ ft 2

Answer: 56 ft 2

Explanation: The two lateral face area is 6×1 1/3 = 6× 4/3 = 2×4 = 8 ft 2 The area of the other two lateral faces is 6×3= 18 The area of the top and bottom is 3× 1 1/3 = 3× 4/3 = 4 ft 2 The area of the sides she intends to paint is 2×8+2×18+4 = 16+36+4 = 56 ft 2

Question 9. A triangular pyramid has lateral faces with bases of 6 meters and heights of 9 meters. The area of the base of the pyramid is 15.6 square meters. What is the surface area of the pyramid?

Answer: 96.6 m 2

Explanation: The area of one face is 1/2× 6× 9 = 3×9 = 27 m 2 The surface area of the triangular pyramid is 15.6+3×27 = 15.6+ 81 = 96.6 m 2

Solving Surface Area Problems Lesson 11.4 Answer Key Question 10. What is the surface area of a storage box that measures 15 centimeters by 12 centimeters by 10 centimeters? _______ cm 2

Answer: 900 cm 2

Explanation: The area of the two faces is 15×12= 180 cm 2 The area of another two faces is 15×10= 150 cm 2 The area of the other two faces is 10×12= 120 cm 2 So the surface area of the storage box is 2×180+2×150+2×120 cm 2 = 360+300+240 = 900 cm 2

Question 11. A small refrigerator is a cube with a side length of 16 inches. Use the formula S = 6s 2 to find the surface area of the cube. _______ in. 2

Answer: 1,536 in. 2

Explanation: Area = s 2 = 6×(16) 2 = 6× 256 = 1,536 in. 2

Question 1. A prism is filled with 38 cubes with a side length of \(\frac{1}{2}\) unit. What is the volume of the prism in cubic units? _______ \(\frac{□}{□}\) cubic units

Answer: 4.75 cubic units

Explanation: The volume of the cube is S 3 The volume of a cube with S= (1/2) 3 = 1/2×1/2×1/2 = 1/8 = 0.125 cubic units As there are 38 cubes so 38×0.125= 4.75 cubic units.

Question 2. A prism is filled with 58 cubes with a side length of \(\frac{1}{2}\) unit. What is the volume of the prism in cubic units? _______ \(\frac{□}{□}\) cubic units

Answer: 7.25 cubic units.

Explanation: The volume of the cube is S 3 The volume of a cube with S= (1/2) 3 = 1/2×1/2×1/2 = 1/8 = 0.125 cubic units As there are 58 cubes so 58×0.125= 7.25 cubic units.

Find the volume of the rectangular prism.

Answer: 33 cubic units.

Explanation: The volume of the rectangular prism is= Width×Height×Length = 5 1/2 ×3×2 = 11/2 ×3×2 = 33 cubic units.

Answer: 91 1/8 cubic units.

Explanation: The volume of the rectangular prism is= Width×Height×Length = 4 1/2 ×4 1/2×4 1/2 = 9/2 ×9/2×9/2 = 729/8 = 91 1/8 cubic units.

Question 5. Theodore wants to put three flowering plants in his window box. The window box is shaped like a rectangular prism that is 30.5 in. long, 6 in. wide, and 6 in. deep. The three plants need a total of 1,200 in. 3 of potting soil to grow well. Is the box large enough? Explain.

Answer: No, the box is not large enough as the three plants need a total of 1,200 in. 3 and here volume is 1,098 in. 3

Explanation: Volume= Width×Height×Length = 30.5×6×6 = 1,098 in. 3

Question 6. Explain how use the formula V = l × w × h to verify that a cube with a side length of \(\frac{1}{2}\) unit has a volume of \(\frac{1}{8}\) of a cubic unit.

Answer: 1/8 cubic units

Explanation: As length, width and height is 1/2′ so Volume = Width×Height×Length = 1/2 × 1/2 × 1/2 = 1/8 cubic units

Question 7. Karyn is using a set of building blocks shaped like rectangular prisms to make a model. The three types of blocks she has are shown at right. What is the volume of an A block? (Do not include the pegs on top.) \(\frac{□}{□}\) cubic units

Answer: 1/2 cubic units

Explanation: Volume = Width×Height×Length = 1× 1/2 ×1 = 1/2 cubic units

Volume and Surface Area Answer Key Question 8. How many A blocks would you need to take up the same amount of space as a C block? _______ A blocks

Answer: No of blocks required to take up the same amount of space as a C block is 4 A blocks.

Explanation: Volume = Width×Height×Length = 1×2×1 = 2 cubic unit No of blocks required to take up the same amount of space as a C block is 1/2 ÷2 = 2×2 = 4 A blocks

Question 9. Karyn puts a B block, two C blocks, and three A blocks together. What is the total volume of these blocks? _______ \(\frac{□}{□}\) cubic units

Answer: 6 1/2 cubic units

Explanation: The volume of A block is Volume = Width×Height×Length = 1×1 ×1/2 = 1/2 cubic units. As Karyn puts three A blocks together, so 3× 1/2= 3/2 cubic units. The volume of the B block is Volume = Width×Height×Length = 1×1 × 1 = 1 cubic unit. As Karyn puts only one B, so 1 cubic unit. The volume of the C block is Volume = Width×Height×Length = 2×1×1 = 2 cubic units. As Karyn puts two C blocks together, so 2× 2= 4 cubic units. So, the total volume of these blocks is 3/2 + 1+ 4 = 3/2+5 = 13/2 = 6 1/2 cubic units

Question 10. Karyn uses the blocks to make a prism that is 2 units long, 3 units wide, and 1 \(\frac{1}{2}\) units high. The prism is made of two C blocks, two B blocks, and some A blocks. What is the total volume of A blocks used? _______ cubic units

Answer: 3 cubic units.

Explanation: Volume = Width×Height×Length = 2×3×1 1/2 = 2×3× 3/2 = 9 cubic units. The total volume of A block used is 9-(2×2)-(2×1) = 9- 4- 2 = 9-6 = 3 cubic units.

Question 11. Verify the Reasoning of Others Jo says that you can use V = l × w × h or V = h × w × l to find the volume of a rectangular prism. Does Jo’s statement make sense? Explain.

Answer: Yes

Explanation: Yes, Jo’s statement makes sense because by the commutative property, we can change the order of the variables of length, width, and height and both will produce the same result.

Question 12. A box measures 5 units by 3 units by 2 \(\frac{1}{2}\) units. For numbers 12a–12b, select True or False for the statement. 12a. The greatest number of cubes with a side length of \(\frac{1}{2}\) unit that can be packed inside the box is 300. 12b. The volume of the box is 37 \(\frac{1}{2}\) cubic units. 12a. __________ 12b. __________

Answer: 12a True. 12b True.

Explanation: The volume of the cube is S 3 The volume of a cube with S= (1/2) 3 = 1/2×1/2×1/2 = 1/8 cubic units As there are 300 cubes so 300× 1/8= 75/2 = 37 1/2 cubic units.

Answer: 6 3/4 cubic units

Explanation: Volume = Width×Height×Length = 3× 1 1/2× 1 1/2 = 3× 3/2 × 3/2 = 27/4 = 6 3/4 cubic units

Answer: 22 1/2 cubic units

Explanation: Volume = Width×Height×Length = 5×1× 4 1/2 = 5× 9/2 = 45/2 = 22 1/2 cubic units

Answer: 16 1/2 cubic units.

Explanation: Volume = Width×Height×Length = 5 1/2× 1 1/2× 2 = 11/2×3/2×2 = 33/2 = 16 1/2 cubic units.

Answer: 28 1/8 cubic units.

Explanation: Volume = Width×Height×Length = 2 1/2× 2 1/2 × 4 1/2 = 5/2 × 5/2 × 9/2 = 225/8 = 28 1/8 cubic units.

Question 5. Miguel is pouring liquid into a container that is 4 \(\frac{1}{2}\) inches long by 3 \(\frac{1}{2}\) inches wide by 2 inches high. How many cubic inches of liquid will fit in the container? _______ \(\frac{□}{□}\) in. 3

Answer: 31 1/2 cubic units

Explanation: Volume = Width×Height×Length = 4 1/2 × 3 1/2 ×2 = 9/2 × 7/2 × 2 = 63/2 = 31 1/2 cubic units

Go Math Grade 6 Chapter 11 Answer Key Pdf Question 6. A shipping crate is shaped like a rectangular prism. It is 5 \(\frac{1}{2}\) feet long by 3 feet wide by 3 feet high. What is the volume of the crate? _______ \(\frac{□}{□}\) ft 3

Answer: 49 1/2 ft 3

Explanation: Volume = Width×Height×Length = 5 1/2 × 3 × 3 = 11/2 ×9 = 99/2 = 49 1/2 ft 3

Question 7. How many cubes with a side length of \(\frac{1}{4}\) unit would it take to make a unit cube? Explain how you determined your answer.

Answer: There will be 4×4×4= 64 cubes and 1/4 unit in the unit cube.

Explanation: As the unit cube has a 1 unit length, 1 unit wide, and 1 unit height So length 4 cubes = 4× 1/4= 1 unit width 4 cubes = 4× 1/4= 1 unit height 4 cubes = 4× 1/4= 1 unit So there will be 4×4×4= 64 cubes and 1/4 unit in the unit cube.

Question 1. A rectangular prism is 4 units by 2 \(\frac{1}{2}\) units by 1 \(\frac{1}{2}\) units. How many cubes with a side length of \(\frac{1}{2}\) unit will completely fill the prism?

Answer: 120 cubes

Explanation: No of cubes with a side length of 1/2 unit is Length 8 cubes= 8× 1/2= 4 units Width 5 cubes= 5× 1/2= 5/2= 2 1/2 units Height 3 cubes= 3× 1/2= 3/2= 1 1/2 units So there are 8×5×3= 120 cubes in the prism.

Question 2. A rectangular prism is filled with 196 cubes with \(\frac{1}{2}\)-unit side lengths. What is the volume of the prism in cubic units? _______ \(\frac{□}{□}\) cubic units

Answer: 24 1/2 cubic units.

Explanation: As it takes 8 cubes with a side length of 1/2 to form a unit cube, so the volume of the prism in the cubic units is 196÷8= 24 1/2 cubic units.

Question 3. A parallelogram-shaped piece of stained glass has a base measuring 2 \(\frac{1}{2}\) inches and a height of 1 \(\frac{1}{4}\) inches. What is the area of the piece of stained glass? _______ \(\frac{□}{□}\) in. 2

Answer: 3 1/8 in. 2

Explanation: Area of a parallelogram = base×height = 2 1/2 × 1 1/4 = 5/2 × 5/4 = 25/8 = 3 1/8 in. 2

Question 4. A flag for the sports club is a rectangle measuring 20 inches by 32 inches. Within the rectangle is a yellow square with a side length of 6 inches. What is the area of the flag that is not part of the yellow square? _______ in. 2

Answer: 604 in. 2

Explanation: Area of a flag= Length×width = 20×32 = 640 in. 2 Area of the yellow square= S 2 = 6 = 36 in. 2 So the area of the flag that is not a part of the yellow square is 640-36= 604 in. 2

Answer: 80 square units

Explanation: Area of two faces is 12 squares Area of other two faces is 16 squares Area of another two faces is 12 squares So the surface area is 2×12+2×16+2×12 = 24+32+24 = 80 square units

Answer: 161 cm 2

Explanation: The area of the base is 7×7= 49 cm 2 And the area of one face is 1/2 × 7× 8 = 7×4 = 28 cm 2 The surface area of the square pyramid is 49+4×28 = 49+112 = 161 cm 2

Find the volume.

Answer: 3,937 1/2 in. 3

Explanation: Volume= Length× wide× height = 10 1/2 ×15 × 25 = 11/2 × 15 × 25 = 4,125/2 = 3,937 1/2 in. 3

Answer: 27/512 in. 3

Explanation: Volume= Length× wide× height =3/8 ×3/8 × 3/8 = 27/512 in. 3

Find the volume of the prism.

Answer: 690 5/8in. 3

Explanation: Volume= Length× wide× height = 8 1/2 × 6 1/2 × 12 1/2 = 17/2 × 13/2× 25/2 = 5525/2 = 690 5/8in. 3

Answer: 125/4096 in. 3

Explanation: Volume= Length× wide× height = 5/16 ×5/16 × 5/16 = 125/4096 in. 3

Answer: 20 yd 3

Explanation: Area= 3 1/3 yd 2 So Area= wide×height 3 1/3= w × 1 1/3 10/3= w× 4/3 w= 10/3 × 3/4 w= 5/2 w= 2.5 yd Volume= Length×width×height = 6× 2.5× 1 1/3 = 6×2.5× 4/3 = 2×2.5×4 = 20 yd 3

Question 6. Wayne’s gym locker is a rectangular prism with a width and height of 14 \(\frac{1}{2}\) inches. The length is 8 inches greater than the width. What is the volume of the locker? _______ \(\frac{□}{□}\) in. 3

Answer: 4,730 5/8 in. 3

Explanation: As length is 8 inches greater than width, so 14 1/2+ 8 = 29/2+8 = 45/2 = 22 1/2 in Then volume= Length×width×height = 22 1/2 × 14 1/2 × 14 1/2 = 45/2× 29/2× 29/2 = 37845/8 = 4,730 5/8 in. 3

Answer: 33 3/4 ft 3

Explanation: The volume of rectangular prism is= Length×width×height = 4 1/2× 2 1/2× 3 = 9/2 × 5/2× 3 = 135/3 = 33 3/4 ft 3

Question 8. Find the width of Tank 2 and the height of Tank 3.

Answer: Width of Tank 2= 8m, Height of the Tank 3= 10 m

Explanation: The volume of Tank 2= 384 m 3 so V= LWH 384=  12×W×4 W= 384/48 W= 8 m So the width of Tank 2= 8m The volume of Tank 3= 2160 m So V= LWH 2160= 18×12×H H= 2160/216 H= 10 m So the height of Tank 3 = 10 m

Grade 6 Mathematics Unit 11 Area and Surface Area Answer Key Question 9. To keep the fish healthy, there should be the correct ratio of water to fish in the tank. One recommended ratio is 9 L of water for every 2 fish. Find the volume of Tank 4. Then use the equivalencies 1 cm 3 = 1 mL and 1,000 mL = 1 L to find how many fish can be safely kept in Tank 4.

Answer: 35 Fishes

Explanation: Volume of Tank 4 = LWH = 72×55×40 = 1,58,400 cm 3 As 1 cm 3 = 1 mL and 1,000 mL = 1 L 1,58,400 cm 3 = 1,58,400 mL and 1,58,400 mL = 158.4 L So the tank can keep safely (158.4÷ 9)×2 = (17.6)× 2 = 35.2 = 35 Fishes

Question 10. Use Reasoning Give another set of dimensions for a tank that would have the same volume as Tank 2. Explain how you found your answer.

Answer: Another set of dimensions for a tank that would have the same volume as Tank 2 is 8m by 8m by 6m. So when we multiply the product will be 384

Answer: 150 5/16 m 3

Explanation: Volume= Length×width×height = 5× 3 1/4× 9 1/4 = 5× 13/4 × 37/4 = 2405/16 = 150 5/16 m 3

Answer: 27 1/2 in. 3

Explanation: Volume= Length×width×height = 5 1/2 × 2 1/2 × 2 = 11/2 × 5/2 × 2 = 55/2 = 27 1/2 in. 3

Answer: 91 1/8 mm 3

Explanation: Volume= Length×width×height = 4 1/2 × 4 1/2 × 4 1/2 = 9/2 × 9/2 × 9/2 = 729/8 = 91 1/8 mm 3

Answer: 112 1/2 ft 3

Explanation: Volume= Length×width×height = 7 1/2 × 2 1/2 × 6 = 15/2 × 5/2 × 6 = 225/2 = 112 1/2 ft 3

Answer: 36 m 3

Explanation: The area of the shaded face is Length × width= 8 m 2 The volume of the prism= Length×width×height = 8 × 4 1/2 = 8 × 9/2 = 4 × 9 = 36 m 3

Answer: 30 3/8 ft 3

Explanation: Volume of the prism= Length×width×height = 2 1/4 × 6 × 2 1/4 = 9/4 × 6 × 9/4 = 243/8 = 30 3/8 ft 3

Question 7. A cereal box is a rectangular prism that is 8 inches long and 2 \(\frac{1}{2}\) inches wide. The volume of the box is 200 in. 3 . What is the height of the box? _______ in.

Answer: H= 10 in

Explanation: As volume = 200 in. 3 . So V= LWH 200= 8 × 2 1/2 × H 200= 8 × 5/2 × H 200= 20 × H H= 10 in

Question 8. A stack of paper is 8 \(\frac{1}{2}\) in. long by 11 in. wide by 4 in. high. What is the volume of the stack of paper? _______ in. 3

Answer: 374 in. 3

Explanation: The volume of the stack of paper = LWH = 8 1/2 × 11 × 4 = 17/2 × 11 × 4 = 374 in. 3

Question 9. Explain how you can find the side length of a rectangular prism if you are given the volume and the two other measurements. Does this process change if one of the measurements includes a fraction?

Answer: We can find the side length of a rectangular prism if you are given the volume and the two other measurements by dividing the value of the volume by the product of the values of width and height of the prism. And the process doesn’t change if one of the measurements include a fraction.

Question 1. A kitchen sink is a rectangular prism with a length of 19 \(\frac{7}{8}\) inches, a width of 14 \(\frac{3}{4}\) inches, and height of 10 inches. Estimate the volume of the sink.

Answer: 3,000 in. 3

Explanation: Length = 19 7/8 as the number was close to 20 and width 14 3/4 which is close to 15 and height is 10 So Volume= LBH = 20 × 15 × 10 = 3,000 in. 3

Chapter 11 Surface Area and Volume Answer Key Question 2. A storage container is a rectangular prism that is 65 centimeters long and 40 centimeters wide. The volume of the container is 62,400 cubic centimeters. What is the height of the container?

Answer: H= 24 cm

Explanation: Volume of container= LBH Volume= 62,400 cubic centimeters 62,400 = 65× 40 × H 62,400 = 2600 × H H= 62,400/ 2600 H= 24 cm

Question 3. Carrie started at the southeast corner of Franklin Park, walked north 240 yards, turned and walked west 80 yards, and then turned and walked diagonally back to where she started. What is the area of the triangle enclosed by the path she walked? _______ yd 2

Answer: 9,600 yd 2

Explanation: Area of triangle= 1/2 bh = 1/2 × 240 × 80 = 240 × 40 = 9,600 yd 2

Question 4. The dimensions of a rectangular garage are 100 times the dimensions of a floor plan of the garage. The area of the floor plan is 8 square inches. What is the area of the garage?

Answer: 80,000 in 2

Explanation: As 1 in 2 = 10,000 in 2 , so area of the floor plan 8 in = 8×10000 = 80,000 in 2

Question 5. Shiloh wants to create a paper-mâché box shaped like a rectangular prism. If the box will be 4 inches by 5 inches by 8 inches, how much paper does she need to cover the box?

Answer: 184 in 2

Explanation: Area of the rectangular prism= 2(wl+hl+hw) = 2(4×5 + 5×8 + 8×4) = 2(20+40+32) = 2(92) = 184 in 2

Question 6. A box is filled with 220 cubes with a side length of \(\frac{1}{2}\) unit. What is the volume of the box in cubic units? _______ \(\frac{□}{□}\) cubic units

Answer: 27.5 cubic units.

Explanation: The volume of a cube side is (1/2) 3 = 1/8 So 220 cubes= 220× 1/8 = 27.5 cubic units.

Question 1. An aquarium tank in the shape of a rectangular prism is 60 cm long, 30 cm wide, and 24 cm high. The top of the tank is open, and the glass used to make the tank is 1 cm thick. How much water can the tank hold? _______ cm 3

Answer: So tank can hold 37,352 cm 3

Explanation: As Volume= LBH Let’s find the inner dimensions of the tank, so 60-2 × 30-2 × 24-1 = 58×28×23 = 37,352 cm 3

Question 2. What if, to provide greater strength, the glass bottom were increased to a thickness of 4 cm? How much less water would the tank hold? _______ cm 3

Answer: 4,872 cm 3

Explanation: As the glass bottom was increased to a thickness of 4 cm, 60-2 × 30-2 × 24-4 = 58×28×20 = 32,480 cm 3 So the tank can hold 37,352- 32,480= 4,872 cm 3

Question 3. An aquarium tank in the shape of a rectangular prism is 40 cm long, 26 cm wide, and 24 cm high. If the top of the tank is open, how much tinting is needed to cover the glass on the tank? Identify the measure you used to solve the problem. _______ cm 3

Answer: 4,208 cm 3  tinting needed to cover the glass on the tank.

Explanation: The lateral area of the two faces is 26×24= 624 cm 2 The lateral area of the other two faces is 40×24= 960 cm 2 And the area of the top and bottom is 40×26= 1040 cm 2 So the surface area of the tank without the top is 2×624 + 2×960 + 1040 = 1,248+1,920+1,040 = 4,208 cm 3

Question 4. The Louvre Museum in Paris, France, has a square pyramid made of glass in its central courtyard. The four triangular faces of the pyramid have bases of 35 meters and heights of 27.8 meters. What is the area of glass used for the four triangular faces of the pyramid?

Answer: 1946 m 2

Explanation: The area of one face is 1/2 × 35 × 27.8= 486.5 m 2 And the area of glass used for the four triangular faces of the pyramid is 4×486.5= 1946 m 2

Question 5. A rectangular prism-shaped block of wood measures 3 m by 1 \(\frac{1}{2}\) m by 1 \(\frac{1}{2}\) m. How much of the block must a carpenter carve away to obtain a prism that measures 2 m by \(\frac{1}{2}\) m by \(\frac{1}{2}\) m? _______ \(\frac{□}{□}\) m 3

Answer: 6 1/4 m 3

Explanation: The volume of the original block= LWH = 3 × 1 1/2 × 1 1/2 = 3× 3/2 × 3/2 = 27/4 = 6 3/4 m 2 And volume of carpenter carve is 2× 1/2 × 1/2 = 1/2 m 2 So, the carpenter must carve 27/4 – 1/2 = 25/2 = 6 1/4 m 3

Question 6. The carpenter (Problem 5) varnished the outside of the smaller piece of wood, all except for the bottom, which measures \(\frac{1}{2}\) m by \(\frac{1}{2}\) m. Varnish costs $2.00 per square meter. What was the cost of varnishing the wood? $ _______

Answer: $8.50

Explanation: The area of two lateral faces are 2×1/2= 1 m 2 The area of the other two lateral faces are 2×1/2= 1 m 2 The area of the top and bottom is 1/2×1/2= 1/4 m 2 And the surface area is 2×1 + 2×1 + 1/4 = 2+2+1/4 = 17/4 = 4.25 m 2 And the cost of vanishing the wood is $2.00× 4.25= $8.50

Question 7. A wax candle is in the shape of a cube with a side length of 2 \(\frac{1}{2}\) in. What volume of wax is needed to make the candle? _______ \(\frac{□}{□}\) in. 3

Explanation: The Volume of wax is needed to make the candle is= LWH = 2 1/2 × 2 1/2 × 2 1/2 = 5/2 × 5/2 × 5/2 = 125/8 = 15 5/8 in. 3

Question 8. Describe A rectangular prism-shaped box measures 6 cm by 5 cm by 4 cm. A cube-shaped box has a side length of 2 cm. How many of the cube-shaped boxes will fit into the rectangular prismshaped box? Describe how you found your answer.

Answer: 12 cube-shaped boxes

Explanation: As 6 small boxes can fit on the base i.e 6 cm by 5 cm, as height is 4cm there can be a second layer of 6 small boxes. So, there will be a total of 12 cube-shaped boxes and will fit into a rectangular prism-shaped box

Question 9. Justin is covering the outside of an open shoe box with colorful paper for a class project. The shoe box is 30 cm long, 20 cm wide, and 13 cm high. How many square centimeters of paper are needed to cover the outside of the open shoe box? Explain your strategy _______ cm 2

Answer: 1,900 cm 2

Explanation: The area of the two lateral faces of the shoebox is 20×13= 260 cm 2 The area of another two lateral faces of the shoebox is 30×13= 390 cm 2 The area of the top and bottom is 30×20= 600 cm 2 So, the surface area of the shoebox without the top is 2×260 + 2× 390 + 600 = 520+780+600 = 1,900 cm 2

Read each problem and solve.

Question 1. The outside of an aquarium tank is 50 cm long, 50 cm wide, and 30 cm high. It is open at the top. The glass used to make the tank is 1 cm thick. How much water can the tank hold? _______ cm 3

Answer: So water tank can hold 66,816 cm 3

Explanation: The volume of inner dimensions of the aquarium is 50-2 × 50-2 × 30-1 = 48×48×29 = 66,816 cm 3 So water tank can hold 66,816 cm 3

Question 2. Arnie keeps his pet snake in an open-topped glass cage. The outside of the cage is 73 cm long, 60 cm wide, and 38 cm high. The glass used to make the cage is 0.5 cm thick. What is the inside volume of the cage? _______ cm 3

Answer: The volume of the cage is 1,59,300 cm 3

Explanation: The volume of inner dimensions is 73-1 × 60-1 × 38-0.5 = 72×59×37.5 = 1,59,300 cm 3 So, the volume of the cage is 1,59,300 cm 3

Question 3. A display number cube measures 20 in. on a side. The sides are numbered 1–6. The odd-numbered sides are covered in blue fabric and the even-numbered sides are covered in red fabric. How much red fabric was used? _______ in. 2

Answer: 1200 in. 2

Explanation: The area of each side of a cube is 20×20= 400 in. 2 , as there are 3 even-numbered sides on the cube. So there will be 3×400= 1200 in. 2

Question 4. The caps on the tops of staircase posts are shaped like square pyramids. The side length of the base of each cap is 4 inches. The height of the face of each cap is 5 inches. What is the surface area of the caps for two posts? _______ in. 2

Answer: 112 in. 2

Explanation: The area of the base is 4×4= 16 in. 2 The area of one face is 1/2×5×4= 10 in. 2 The surface area of one cap is 16+4×10 = 16+40 = 56 in. 2 And the surface area of the caps for two posts is 2×56= 112 in. 2

Question 5. A water irrigation tank is shaped like a cube and has a side length of 2 \(\frac{1}{2}\) feet. How many cubic feet of water are needed to completely fill the tank? _______ \(\frac{□}{□}\) ft 3

Answer: 15 5/8 ft 3

Explanation: Volume= LWH = 2 1/2 × 2 1/2 × 2 1/2 = 5/2 × 5/2 × 5/2 = 125/8 = 15 5/8 ft 3

Question 6. Write and solve a problem for which you use part of the formula for the surface area of a triangular prism.

Answer: In a triangular prism, the triangular end has a base of 5cm and the height is 8 cm. The length of each side is 4 cm and the height of the prism is 10 cm. What is the lateral area of this triangular prism?

Explanation: The area of two triangular faces is 1/2 × 5 × 8 = 5×4 = 20 cm 2 The area of two rectangular faces is 4×10= 40 cm 2 The lateral area is 2×20+2×40 = 40+80 = 120 cm 2

Question 1. Maria wants to know how much wax she will need to fill a candle mold shaped like a rectangular prism. What measure should she find?

Answer: Maria needs to find the volume of the mold.

Question 2. The outside of a closed glass display case measures 22 inches by 15 inches by \(\frac{1}{2}\) inches. The glass is 12 inch thick. How much air is contained in the case? _______ in. 3

Answer: 3381 in. 3

Explanation: The inner dimensions are 22-1× 15-1 × 12- 1/2 = 21 ×14×23/2 = 3381 in. 3

Question 3. A trapezoid with bases that measure 5 centimeters and 7 centimeters has a height of 4.5 centimeters. What is the area of the trapezoid? _______ cm 2

Answer: 27 cm 2

Explanation: Area of trapezoid= 1/2 ×(7+5)×4.5 = 6×4.5 = 27 cm 2

Question 4. Sierra has plotted two vertices of a rectangle at (3, 2) and (8, 2). What is the length of the side of the rectangle? _______ units

Answer: 5 units.

Explanation: The length of the side of the rectangle is 8-3= 5 units.

Answer: 104 m 2

Explanation: The area of the base 4×4= 16 The area of the one face is 1/2 × 4 × 11 = 2×11 = 22 m 2 The surface area of the square pyramid is 16+4×22 = 16+88 = 104 m 2

Question 6. A shipping company has a rule that all packages must be rectangular prisms with a volume of no more than 9 cubic feet. What is the maximum measure for the height of a box that has a width of 1.5 feet and a length of 3 feet? _______ feet

Answer: 2 feet.

Explanation: As given volume = 9 cubic feet So 1.5×3×H < 9 4.5×H < 9 H< 9/4.5 and H<2 So maximum measure for the height of the box is 2 feet.

Question 1. Elaine makes a rectangular pyramid from paper. The base is a _____. The lateral faces are _____. The base is a ___________ . The lateral faces are ___________ .

Answer: The base is a rectangle. The lateral faces are triangles.

Answer: b,c

Explanation: The expressions that show how to find the surface area is 2(20 × 12) + 2(15 × 12) + (20 × 15), (20 × 12) + (20 × 12) + (15 × 12) + (15 × 12) + (20 × 15)

Question 3. A prism is filled with 44 cubes with \(\frac{1}{2}\)-unit side lengths. What is the volume of the prism in cubic units? _______ \(\frac{□}{□}\) cubic unit

Explanation: The volume of a cube with S= (1/2) 3 = 1/2×1/2×1/2 = 1/8 = 0.125 cubic units As there are 44 cubes so 44×0.125=5.5 cubic units.

Question 4. A triangular pyramid has a base with an area of 11.3 square meters, and lateral faces with bases of 5.1 meters and heights of 9 meters. Write an expression that can be used to find the surface area of the triangular pyramid.

Answer: 11.3+ 3 × 1/2+ 5.1×9

Explanation: The expression that can be used to find the surface area of the triangular pyramid is 11.3+ 3 × 1/2+ 5.1×9

Question 5. Jeremy makes a paperweight for his mother in the shape of a square pyramid. The base of the pyramid has a side length of 4 centimeters, and the lateral faces have heights of 5 centimeters. After he finishes, he realizes that the paperweight is too small and decides to make another one. To make the second pyramid, he doubles the length of the base in the first pyramid. For numbers 5a–5c, choose Yes or No to indicate whether the statement is correct. 5a. The surface area of the second pyramid is 144 cm 2 . 5b. The surface area doubled from the first pyramid to the second pyramid. 5c. The lateral area doubled from the first pyramid to the second pyramid. 5a. ___________ 5b. ___________ 5c. ___________

Answer: 5a. True. 5b. False 5c. True.

Explanation: The area of the base is 4×4= 16 cm 2 . The area of one face is 1/2×4×5 = 2×5 = 10 cm 2 . The surface area of the First pyramid is 16+ 4×10 = 16+40 = 56 cm 2 . The area of the base is 8×8= 64 The area of one face is 1/2×8×5 = 4×5 = 20 cm 2 . The surface area od the second pyramid is 64+ 4×20 = 64+80 = 144 cm 2 .

Answer: 369 in 2

Explanation: The area of the base is 9×9= 81 in 2 The area of one face is 1//2 × 16× 9 = 8×9 = 72 in 2 The surface area of a square pyramid is 81+ 4× 72 = 81+ 288 = 369 in 2

Question 7. Dominique has a box of sewing buttons that is in the shape of a rectangular prism. The volume of the box is 2 \(\frac{1}{2}\) in. × 3 \(\frac{1}{2}\) in. × _____ = _____.

Answer: 17.5 in 3

Explanation: The volume of the box is 2 1/2 × 3 1/2 × 2 = 5/2 × 7/2 × 2 = 5/2 × 7 = 35/2 = 17.5 in 3

Question 8. Emily has a decorative box that is shaped like a cube with a height of 5 inches. What is the surface area of the box? _______ in. 2

Explanation: Surface area of the box is 6 a 2 So 6 × 5 2 = 6×5×5 2 = 150 in. 2

Answer: c, d

Explanation: 2 units ×1/2 unit × 2 1/2 units and 2.5 cubic units

Answer: 11a. True. 11b. True. 11c. False. 11d. False.

Explanation: The area of the face A is 4×2= 8 square units The area of the face B is 5×2= 10 square units The area of the face C is 5×4= 20 square units So the surface area is 2×8+2×10+2×20 = 16+20+40 = 76 square units

Question 12. Stella received a package in the shape of a rectangular prism. The box has a length of 2 \(\frac{1}{2}\) feet, a width of 1 \(\frac{1}{2}\) feet, and a height of 4 feet. Part A Stella wants to cover the box with wrapping paper. How much paper will she need? Explain how you found your answer

Answer: 39.5 ft 2

Explanation: The area of two lateral faces is 4 × 2 1/2 = 4 × 5/2 = 2×5 = 10 ft 2 The area of another two lateral faces is 4 × 1 1/2 = 4 × 3/2 = 2×3 = 6 ft 2 The area of the top and bottom is 2 1/2 × 1 1/2 = 5/2 × 3/2 = 15/4 = 3 3/4 ft 2 So Stella need 2×10+ 2×6 + 2 × 15/4 = 20+ 12+15/2 = 20+12+7.5 = 39.5 ft 2

Question 12. Part B Can the box hold 16 cubic feet of packing peanuts? Explain how you know

Answer: The box cannot hold 16 cubic feet of the packing peanuts

Explanation: Volume = LWH = 2 1/2 ×1 1/2 × 4 = 5/2 × 3/2 ×4 = 5×3 = 15 ft 3 So the box cannot hold 16 cubic feet of the packing peanuts.

Question 13. A box measures 6 units by \(\frac{1}{2}\) unit by 2 \(\frac{1}{2}\) units. For numbers 13a–13b, select True or False for the statement. 13a. The greatest number of cubes with a side length of \(\frac{1}{2}\) unit that can be packed inside the box is 60. 13b. The volume of the box is 7 \(\frac{1}{2}\) cubic units. 13a. ___________ 13b. ___________

Answer: 13a. True 13b. True.

Explanation: Length is 12 × 1/2= 6 units Width is 1× 1/2= 1/2 units Height is 5× 1/2= 5/2 units So, the greatest number of cubes with a side length of 1/2 unit that can be packed inside the box is 12×1×5= 60 The volume of the cube is S 3 The volume of a cube with S= (1/2) 3 = 1/2×1/2×1/2 = 1/8 = 0.125 cubic units As there are 60 cubes so 60×0.125= 7.5cubic units.

Question 14. Bella says the lateral area of the square pyramid is 1,224 in. 2 . Do you agree or disagree with Bella? Use numbers and words to support your answer. If you disagree with Bella, find the correct answer.

Answer: 900 in 2

Explanation: Area= 4× 1/2 bh = 4× 1/2 × 18 × 25 = 2× 18 × 25 =  900 in 2 So lateral area is 900 in 2 , so I disagree

Question 15. Lourdes is decorating a toy box for her sister. She will use self-adhesive paper to cover all of the exterior sides except for the bottom of the box. The toy box is 4 feet long, 3 feet wide, and 2 feet high. How many square feet of adhesive paper will Lourdes use to cover the box? _______ ft 2

Answer: 40 ft 2

Explanation: The area of two lateral faces is 4×2= 8 ft 2 The area of another two lateral faces is 3×2= 6 ft 2 The area of the top and bottom is 4×3= 12 ft 2 So Lourdes uses to cover the box is 2×8 + 2×6 + 12 = 16+12+12 = 40 ft 2

Answer: Length of shed 1= 12 ft Width of shed 2= 12 ft Height of shed 3= 6 ft Volume of shed 4= 1200 ft 3

Explanation: Volume= LWH Volume of shed1= 960 ft So 960= L×10×8 960= 80×L L= 960/80 L= 12 ft Volume of shed2= 2160 ft So 2160= 18×W×10 960= 180×W W= 2160/180 W= 12 ft Volume of shed3= 288 ft So 288= 12×4×H 288= 48×H H= 288/48 W= 6 ft Volume of shed2= 10×12×10 So V= 10×12×10 V= 1200 ft 3

Question 17. Tina cut open a cube-shaped microwave box to see the net. How many square faces does this box have? _______ square faces

Answer: The box has 6 square faces.

Answer: a and b can be used to represent Charle’s treasure box.

Question 19. Julianna is lining the inside of a basket with fabric. The basket is in the shape of a rectangular prism that is 29 cm long, 19 cm wide, and 10 cm high. How much fabric is needed to line the inside of the basket if the basket does not have a top? Explain your strategy. _______ cm 2

Answer: 1511 cm 2

Explanation: The surface area= 2(WL+HL+HW) The surface area of the entire basket= 2(19×29)+2(10×29)+2(10×19) = 2(551)+2(290)+2(190) = 1102+580+380 = 2,062 cm 2 The surface area of the top is 29×19= 551 So Julianna needs 2062-551= 1511 cm 2

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