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The rate of change of the area of a circle with respect to its radius r when r = 6 is (A) 10 p (B) 12 p (C) 8 p (D) 11 p

The rate of change of the area of a circle with respect to its radius r when r = 6 is
(A) 10 p (B) 12 p
(C) 8 p (D) 11 p

Grade:Upto college level

1 Answers

SHAIK AASIF AHAMED
askIITians Faculty 74 Points
8 years ago
A = p* r^2

dA/dr = 2p* r
when r=6

dA/dr = 2p*6 = 12p
Hence answer is B
Thanks & Regards
Jitender Singh
IIT Delhi
askIITians Faculty

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