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

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Given: the radius of a circle is increasing at the rate of 0.7 cm/sec.
To find rate of increase of its circumference

Let the radius of the given circle be r cm at any instant time.

Then the circumference of the circle at any time t will be C = 2r cm.