Question

Find the surface area and volume of a sphere of diameter 21 cm.
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Answer 1

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Explanation:

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Answer 2

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Radius - D/2 = 21/2 = 10.5

Surface area of a circle = 4πr2

=4× 22/7×10.5×10.5

= 1386cm2

Volume of sphere = 4/3 πr³

= 4/3 x 22/7 x 10.5 x 10.5 x 10.5

= 4849.05 cm3