If the surface area of a sphere is $9856 c m^{2}$ . Find its diameter.

28 c m

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55 c m

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56 c m

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30 c m

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Solution

The correct option is C $28 c m$
Surface area of sphere $= 9856 c, m^{2}$
$⟹ 4 π r^{2} = 9856 c m^{2}$
$⟹ r = \sqrt{\frac{9856 \times 7}{4 \times 7}} = 28 c m$

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