# 17) The rate of change of the area of a circle with respect to its radius r at r = 6 cm is (A) 10π      (B) 12π       (C) 8π          (D) 11π

Area of circle(A) =

Now, at r = 6cm

Hence, the rate of change of the area of a circle with respect to its radius r at r = 6 cm is
Hence, the correct answer is B

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