A stone is dropped into a quiet lake and waves move in circles at a speed of

Question:

A stone is dropped into a quiet lake and waves move in circles at a speed of $3.5 \mathrm{~cm}$ per second. At the instant when the radius of the circular wave is $7.5 \mathrm{~cm}$. how fast is the enclosed area increasing? (Take $\pi=$ 22/7.)

Solution:

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