1.

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

Answer»

`180pi CM^(2)` / MIN
`7pi cm^(2)`
`27pi cm^(2)` /min
`54pi cm^(2)` /min

Answer :A


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