find the rate of change of area of a circle with respect to its radius
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As, area if circle,A=pi*r*r
dA/dr = d(pi*r*r)/dr
where r is radius of circle and pi=22/7
Now, dA/dr= pi*2r*dr/dr=2*pi*r
dA/dr = d(pi*r*r)/dr
where r is radius of circle and pi=22/7
Now, dA/dr= pi*2r*dr/dr=2*pi*r
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