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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