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

Explanation

Radius of circle is increasing at the rate of 0.7cm/s


` (dR)/(dt)=0.7(cm)/s
`

Circumference of circle=`2piR`

therefore Rate of change of Circumference, C

=`(dc)/(dt)​=2pi(dR)/(dt)`


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