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Solution :

`A= pi r^2` <br>
`(dA)/(dt) = (dA)/(dr)*(dr)/(dt)` <br>
`= 2 pi r (0.05)` <br>
`= 2*3*2 pi *(0.05)` <br>
`= 0.32 pi (cm)^2/s` <br>
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