Published by:
CGP EDU Academic Team
Published on: August 13, 2026
A stone is dropped into a quiet lake and waves move in a circle at a speed of 4 cm/s. At the instant when the radius of the circular wave is 10 cm, the enclosed area increases at the rate :
Text Solution
Verified by ExpertsThe correct answer is:
D
= 4cm/sec
when r = 4cm, A = π r 2
= π .2r 
= π . 2 × 4 × 4 = 32 π cm 2 /sec
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