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A stone is dropped into a quiet lake and...

A stone is dropped into a quiet lake and waves move in circles at a speed of 3.5 cm per second. At the instant when te radius of the circular wave is 10 cm, the rate of increase of the area enclosed is

A

`80 pi`

B

`1760/7`

C

`80 pi cm^2/sec`

D

none of these

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