find the rate of change of area of a circle with respect of radius when its radius is 5 cm
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A=πr^2⇒ dA/dr=2rπ
So when r=5cm, dA/dr=10π cm
But the answer is 10π cm^2/sec.
So when r=5cm, dA/dr=10π cm
But the answer is 10π cm^2/sec.
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