1.

A stone is dropped into a quiet lake and waves move in circles at the speed of 5 cm/sec. At that instant, when the radius of circular wave is 8 cm, how fast is the enclosed area is increasing

Answer»

`6PI cm^(2)//s`
`8 PI cm^(2)//s`
`(8)/(3) cm^(2)//s`
`80 pi cm^(2)//s`

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