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Triangular Prism. 12. 5. 13. 9. 14. 6. 15. Sphere. 16. Cylinder. 17 â18 answers vary. 8.6. Surface Area of Prisms. Answers. 1. Rectangular Prism. 2...
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Answer Key
Chapter 8 – Measurement, Area and Volume 8.1
Find the Dimensions and Area of Triangles
Answers 1. 25 in2 2. 19.25 in2
3. 24 ft2
4. 33.75 ft2
5. 54 m2
6. 90 ft2
7. 21.88 ft2
8. 64.81 ft2
9. 173.81 ft2
10. 2 in.
11. 6 ft.
12. 12 in.
13. 15 ft.
14. 17 ft.
15. 27 ft.
8.2
Find the Dimensions and Area of Quadrilaterals
Answers 1. 75 in2 2. 108 ft2
3. 154 ft2
4. 399 ft2
5. 99 ft2
6. 143 in2
7. 418 ft2
8. 837 m2
9. 26 in2
11. 99 ft2
12. 64 in2
13. 225 ft2
14. 506.25 mm2
8.3
10. 35 in2 15. 333.06 cm2
Circumference of Circles
Answers 1. 31.4 in.
2. 15.7 in
3. 21.98 ft
4. 37.68 mm
5. 43.96 cm
6. 25.12 in
7. 37.68 m
8. 50.24 ft
9. 69.08 in
10. 94.2 cm
11. 17 in.
12. 14 ft.
13. 18 in.
14. 21 m
15. 15.5 m
16. 12 ft.
17. 25 m
18. 32 cm
8.4
Area of Circles
Answers 1. 50.24 in2
2. 28.26 ft2
3. 19.63 in2
4. 78.5 cm2 5. 38.47 in2
6. 254.34 mm2
7. 379.94 cm2
8. 314 in2
9. 153.86 ft2
10. 200.96 in2
11. 3.53 in2
12. 7.73 mm2
13. 13.08 cm2
14. 13.51 in2
15. 2.44 in2
CK‐12 Middle School Math Concepts ‐ Grade 8
1
Answer Key
Chapter 8 – Measurement, Area and Volume 8.5
Classifying Solid Figures
Answers 1. Cylinder
2. 2
3. 0
4. 0
5. Pyramid
6. 5
7.8
8. 5
9. Cone
10. 1 face, 0 edges, 1 vertex
11. Triangular Prism
12. 5
13. 9
14. 6
15. Sphere
16. Cylinder
17 ‐18 answers vary
8.6
Surface Area of Prisms
Answers 1. Rectangular Prism
2. 538 cm2
3. Rectangle
4. 4 cm
5. 165 cm2
6. Rectangular Prism
7. 564.9 m2
8. Rectangle
9. 6 m
10. 139.65
11. Triangular prism
12. Triangle
13. 2 bases
14. 5 faces
15. 78 in2
8.7
Surface Area of Cylinders
Answers 1. Cylinder
2. Circle
3. 2
4. 428.61 ft2
5. Radius
6. Cylinder
7. Radius
8. 560.49 yds2
9. 1256 ft2
10. Surface Area
11. False
12. False
13. True
14. True
15. True
CK‐12 Middle School Math Concepts ‐ Grade 8
2
Answer Key
Chapter 8 – Measurement, Area and Volume 8.8
Surface Area of Pyramids
Answers 1. Square pyramid
2. 20 inches
3. 2000 in2
4. Triangular pyramid
5. Triangle
6. 4
7. 109.2 ft2
8. Square Pyramid
9. 8 inches
10. 112 in2
11. Square pyramid
12. 16 cm
13. 699.52 cm2
14. False
15. False
8.9
Surface Area of Cones
Answers 1. Cone
2. 8 cm
3. 12 cm
4. 200.96 cm2
5. Cone
6. circle
7. 34 m
8. 2332.71 m2
9. Cone
10. Circle
11. 6 in
12. 113.04 in2
13. 113.04 in2
14. 188.4 m2
15. 84.78 cm2
8.10
Volume of Prisms
Answers 1. Rectangular Prism
2. 7 units
3. 3 units
4. 4 units
5. 84 units3
6. triangular prism
7. Triangle
8. rectangle
9. 816 ft3
10. rectangular prism
11. 1679.29 cm3 12. 12 ft.
13. 20 times
14. True
8.11
15. False
Volume of Cylinders
Answers 1. Cylinder
2. 7 cm
3. 3.5 cm
4. 500.05 cm3
5. 251.2 ft3
6. 904.32 cm3
7. 317.93 ft3
8. 269.26 m3
9. 1061.32 ft3
10. 4559.28 m3
11. 21.20 ft3
12. 1846.32 in3
13. 2210.56 cm3 14. 706.5 m3
15. 13,310.46 ft3
CK‐12 Middle School Math Concepts ‐ Grade 8
3
Answer Key
Chapter 8 – Measurement, Area and Volume 8.12
Volume of Pyramids
Answers 1. V = 1/3Bh
2. Area of base
3. Triangular pyramid
4. Triangle
5. 51.6 ft3
6. Rectangular pyramid
7. Base is a rectangle not a triangle
8. 300 cm3
9. Rectangle
10. 14.58 yards
11. 448 cm3
12. 32 in3
13. 93.33 in3
14. 256 m3
15. 911.25 m3
8.13
Volume of Cones
Answers 1. V = 1/3 Bh
2. True
3. False
4. 6 cm
5. 21 cm
6. 197.82 cm3
7. 10 inches
8. 7 inches
9. 183.17 in3
10. 6 cm
11. 3 cm
12. 12 cm
13. 113.04 cm3
14. 84 m
15. 126.60 in3
8.14
Surface Area of Spheres
Answers 1. 50.24 in
2. 25.12 in
3. 43.96 ft
4. 84.15 in
5. 150.72 cm
6. 20.10 ft
7. 113.04 m
8. 56.52 m
9. 113.04 in
10. 62.8 cm
11. 75.36 m
12. 81.64 ft
13. 94.2 m
14. 138.16 cm
15. 5 bottles
8.15
Volume of Spheres
Answers 1. 113.04 m3
2. 65.42 m3
3. 523.33 in3
4. 904.32 in3
5. 1436.03 ft3
6. 381.51 cm3
7. 696.56 m3
8. 9198.11 mm3
9. 2143.57 in3
10. 4186.67 ft3
11. 113.04 m3
12. 9198.11 m3
13. 44579.63 ft3
14. 904.32 ft3
15. 113.04 in3
CK‐12 Middle School Math Concepts ‐ Grade 8
4
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