Q.

If the rate of change in the area of circle is double the rate of change in its radius then the radius is

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a

1π

b

12π

c

1π

d

12π

answer is A.

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Detailed Solution

A=πr2             dAdt=2.drdt             2πr.drdt=2.drdt             r=1π
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Best Books for NEET
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