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Question

What is the diameter (in cm) of a sphere whose surface area is 616 cm2?


A

28

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B

21

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C

7

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D

14

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Solution

The correct option is D

14


Surface area of sphere =
4πr2=616r2=616×722×14r2=49r=49r=7 cm

The diameter, D=2r=2×7=14 cm


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