Q. 6 4.1( 26 Votes )

The radius of a circle is increasing at the rate of 0.7 cm/s. What is the rate of increase of its circumference?

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


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

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