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If by dropping a stone in a quiet lake a...

If by dropping a stone in a quiet lake a wave moves in circle at a speed
of 3.5 cm/sec, then the rate of increase of the enclosed circular region
when the radius of the circular wave is 10 cm, is `(pi=(22)/7)`

A

(a) `220cm^2//sec`

B

(b) `110cm^2//sec`

C

(c) `35cm^2//sec`

D

(d) `350cm^2//sec`

Text Solution

Verified by Experts

The correct Answer is:
A
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