Surface area

The surface area of a solid, of a sphere, and working back to a missing edge.

3 sheets · 24 questions · one answer key · 4 pages

Recommended for grades 6–8

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Surface area Sheet 1 of 3

Surface areaBoxes and nets

Name: Date:

Find the surface area of each box. All lengths are in centimeters.

1 cm²

2 cm²

3 cm²

4 cm²

5 cm²

6 cm²

7 cm²

8 cm²

Sphere surface areaRadius or diameter

Name: Date:

Find the surface area of each sphere. Use π = 3.14.

1 cm²

2 cm²

3 cm²

4 cm²

5 cm²

6 cm²

7 cm²

8 cm²

GeometryMissing edge

Name: Date:

The volume of each box is shown. Find the missing edge, in centimeters.

1 cm

2 cm

3 cm

4 cm

5 cm

6 cm

7 cm

8 cm

Power Pack · Surface areaAnswer key

Surface area

1. 5×11×11 → 2(55 + 55 + 121): 462 cm²2. 5×12×15 → 2(60 + 75 + 180): 630 cm²3. 6×6×14 → 2(36 + 84 + 84): 408 cm²4. 13×14×14 → 2(182 + 182 + 196): 1120 cm²5. 3×11×11 → 2(33 + 33 + 121): 374 cm²6. 10×13×14 → 2(130 + 140 + 182): 904 cm²7. 5×8×9 → 2(40 + 45 + 72): 314 cm²8. 3×10×12 → 2(30 + 36 + 120): 372 cm²

Sphere surface area

1. r = 2: 50.24 cm²2. d = 4: 50.24 cm²3. d = 16: 803.84 cm²4. r = 6: 452.16 cm²5. d = 6: 113.04 cm²6. d = 12: 452.16 cm²7. r = 7: 615.44 cm²8. r = 5: 314 cm²

Missing edge

1. V 18: 3 × x × 2 → x = 32. V 300: 6 × 10 × x → x = 53. V 231: 3 × x × 11 → x = 74. V 120: 5 × 12 × x → x = 25. V 384: 6 × 8 × x → x = 86. V 90: x × 6 × 3 → x = 57. V 70: x × 7 × 2 → x = 58. V 192: 4 × x × 8 → x = 6

Surface area

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