The rate of change of area A of a circle of radius r is …(a) 2πr(b) – InterviewSolution

1.

The rate of change of area A of a circle of radius r is …(a) 2πr(b) 2πr(dr/dt)(c) πr2(dr/dt)(d) π(dr/dt)

Answer»

(b) 2πr(dr/dt)

Given A = πr²

Differentiating with respect to t on both sides,

dA/dt = 2πr(dr/dt)

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