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Find the rate of change of the area of a...

Find the rate of change of the area of a circle with respect to its radius r when
(a) r=3 cm `" "` (b) r=4 cm

Text Solution

Verified by Experts

The correct Answer is:
(a) `6 pi cm^(2)//cm`
(b) `= 8 pi cm^(2)//cm`
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