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The radius of the base of a cone is incr...

The radius of the base of a cone is increasing at the rate of 3 cm/minute and the altitude is decreasing at the rate of 4 cm/minute. The rate f change of lateral surface when the radius = 7 cm and altitude = 24 cm, is

A

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

B

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

C

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

D

none of these

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The correct Answer is:
A
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