The rate of change of surface area of a ...

The rate of change of surface area of a sphere of radius r when the radius is increasing at the rate of 2 cm/sec is proportional to: a)`1/r` b)`r` c)`1/r^2` d)`r^2`

A

`1/r`

B

`1/r^2`

C

r

D

`r^2`

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The correct Answer is:

C

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