Question Number 103094 by I want to learn more last updated on 12/Jul/20

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Commented byI want to learn more last updated on 12/Jul/20

The area of a circle is increasing at the rate of 4cm²/s. Find the rate of change of the circumference when the radius is 6cm.

Commented byI want to learn more last updated on 12/Jul/20

Please workings sir

Commented byDwaipayan Shikari last updated on 12/Jul/20

A=πr^2   (dA/dt)=π.2r(dr/dt)⇒4=π.12(dr/dt)⇒(1/(3π))=(dr/dt)  (dC/dt)=2π.(dr/dt)⇒(dC/dt)=(2/3)cm/s  C=circumference

Commented byI want to learn more last updated on 14/Jul/20

Thanks sir