Using derivative, find the approximate percentage increase in the area of a circle if its radius is increased by 2% .
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given ∆r/r=2%
we know that,A=πr²
∆A=2πr∆r
∆A/A*100=2(∆r/r*100)
=2*2%=4%
we know that,A=πr²
∆A=2πr∆r
∆A/A*100=2(∆r/r*100)
=2*2%=4%
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