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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

Manvendra Singh chahar , 11 Years ago
Grade Upto college level
anser 1 Answers
SHAIK AASIF AHAMED

Last Activity: 11 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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