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

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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)

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(b) 2πr(dr/dt)

Given A = πr2

Differentiating with respect to t on both sides,

dA/dt = 2πr(dr/dt)

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