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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/min and altitude is decreasing at the rate of 4 cm/min. The rate of change of lateral surface when the radius is 7 cm and altitude is 24 is

A

`180pi cm^(2)` / min

B

`7pi cm^(2)`

C

`27pi cm^(2)` /min

D

`54pi cm^(2)` /min

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-RATE MEASUREMENT-PRACTICE SHEET (EXERCISE - 1) (LEVEL - 1) (STRAIGHT OBJECTIVE TYPE QUESTION)
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