If radius of solid sphere is increasing at a rate of 2 \( \mathrm{cm} / \mathrm{sec} \), then fi...

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If radius of solid sphere is increasing at a rate of 2 \( \mathrm{cm} / \mathrm{sec} \), then find rate of increase in its surface area
\( \mathrm{P} \)
when its radius is \( 3 \mathrm{~cm} \) :
W
(1) \( 24 \pi \mathrm{cm}^{2} / \mathrm{s} \)
(2) \( 48 \pi \mathrm{cm}^{2} / \mathrm{s} \)
(3) \( 12 \pi \mathrm{cm}^{2} / \mathrm{s} \)
(4) \( 6 \pi \mathrm{cm}^{2} / \mathrm{s} \)
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