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The radius of a circular blot of oil is ...

The radius of a circular blot of oil is increasing at the rate of 2 cm/min.
Find the rate of change of its area when its radius is 3 cm.

A

`12 pi cm^(2)//min`

B

`6 pi cm^(2)//min`

C

`4pi cm^(2)//min`

D

`2pi cm^(2)//min`

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The correct Answer is:
A
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