Q. 64.3( 48 Votes )

The radius of a c

Answer :

We know that circumference of a circle (C) is C = 2πr

Then, Rate of change of circumference with respect to time (t) is given by,

……………….. by chain rule

It is given that

Then,

Therefore, the rate of increase of its circumference is 1.4π cm/s.

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