1.

if the rate of a sphere increasing at the rate of 0.4 cm //sec, then, when the radius is decimetres , its surface area is increasing at the rate of

Answer»

`160 pi CM ^(2) //sec`.
`16.0 pi cm^(2) //sec`.
`1.60 pi cm^(2)//sec`.
`0.16 pi cm^(2) //sec`.

ANSWER :A


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