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The rate of change of the area of a circ...

The rate of change of the area of a circle with respect to its radius `r` at `r=6 cm` is a)`10 pi` b)`12 pi` c)`8 pi` d)`11 pi`

A

10 pi'

B

12 pi .'

C

8 pi'

D

11 pi'

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The correct Answer is:
B
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