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8.The variation of radius of a circle wi...

8.The variation of radius of a circle with time is given by the relation` r=(2t+3)m` , where t is time in second . the rate of change of area of the circle at `t=1sec ` will be:
(1) `20pim^2`/s
(2) `10pim^2`/s
(3)`15pim^2`/s
(4) `Zero`

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