If by dropping a stone in a quiet lake a wave moves P in circle at ...

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If by dropping a stone in a quiet lake a wave moves
P in circle at a speed of \( 3.5 \mathrm{~cm} / \mathrm{sec} \), then the rate of

W increase of the enclosed circular region when the radius of the circular wave is \( 10 \mathrm{~cm} \), is \( \left(\pi=\frac{22}{7}\right) \)
(A) 220 sq. \( \mathrm{cm} / \mathrm{sec} \)
(B) 110 sq. \( \mathrm{cm} / \mathrm{sec} \)
(C) \( 35 \mathrm{sq} . \mathrm{cm} / \mathrm{sec} \)
(D) 350 sq. \( \mathrm{cm} / \mathrm{sec} \)
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