Asked by billy

Find the rate of change of the area of a circle with respect to the radius r. What is the rate when r = 12
Answered by Damon
A = pi r^2
dA/dr = 2 pi r which is the circumference of course so DA = circumference * dr

if r = 12
2 pi r = 24 pi
Answered by The radius of circle
π cm2/sec
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