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The area of a circle is given by A= pi r...

The area of a circle is given by `A= pi r^(2)`, where r is the radius. Calculate the rate of increase of area w.r.t radius.

Text Solution

Verified by Experts

The correct Answer is:
`2 pi r`
A `= pi r^(2)`
`(dA)/(dr)= (d)/(dr) (pir^(2)) = 2pir `
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