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Q.

A hemisphere of inner diameter 14cm. Then its “Curved surface area (C.S.A)” is

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a

$308 {cm}^{2}$

b

$358 {cm}^{2}$

c

$408 {cm}^{2}$

d

$325 {cm}^{2}$

answer is B.

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Detailed Solution

$d = 14 cm, r = \frac{14}{2} = 7 cm$

$CSA of hemisphere = 2 π r^{2}$

$= 2 \times \frac{22}{7} \times 7 \times 7$

$= 14 \times 22$

$= 308 {cm}^{2}$

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