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Radius of base of a cone is increasing a...

Radius of base of a cone is increasing at `3 cm //min`, and its height decreasing at `4 cm //min`.When the radius is 7 cm. and height 24 cm, its surface area is changing at the rate of

A

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

B

`84 pi ^(2)//min`.

C

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

D

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

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The correct Answer is:
C
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MARVEL PUBLICATION-APLICATIONS OF DERIVATIVES-MULTIPLE CHOICE QUESTIONS (TEST YOUR GRASP - II : CHAPTER 12)
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