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  1. Find the surface area of a sphere with a circumference of 86 cm. Round to the nearest tenth. A. 2,354.2 cm2
B1,177.1 cm2
C187.3 cm2
D13.7 cm2

  1. A balloon has a circumference of 16 cm. Use the circumference to approximate the surface area of the balloon to the nearest square centimeter. A. 804 cm2
B326 cm2
C256 cm2
D81 cm2

Verified Answer :

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  1. Find the surface area of a sphere with a circumference of 86 cm. Round to the nearest tenth.
    C = 2πr
    r = C / 2π  = 86/2π = 43/π cm
    A = 4πr^2 = 4π(43/π)^2 = 2,354.2 cm2

    A. 2,354.2 cm2
    2. A balloon has a circumference of 16 cm. Use the circumference to approximate the surface area of the balloon to the nearest square centimeter.
    C = 2πr
    r = C / 2π  = 16/2π = 8/π cm
    A = 4πr^2 = 4π(8/π)^2 = 81 cm^2
    D. 81 cm2

1.d

2.b

3. a

4. b

5. b

6. d

7. c

8. a

9. a

10. b

11. b

12. b

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