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18.The variation of radius of a circle w...

18.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= 1s` will be
(1) `20pim^2`/s
(2)`10pim^2`/s
(3) `15pim^2`/s
(4) `Zero`

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