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OpenStudy (anonymous):
The area A = πr2 of a circular water ripple changes with the radius. At what rate does the area change with respect to the radius when r = 4ft?
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OpenStudy (anonymous):
I dont really know how to start this problem. Please help!
OpenStudy (anonymous):
A = pi * r^2 dA/dr = 2pi * r r = (dA/dr)/2pi = answer to a dA/dr = 2pi * 500 = 1000 * pi
OpenStudy (anonymous):
did you take the derivative of the area?
OpenStudy (anonymous):
Yes, I did
OpenStudy (anonymous):
Where di the 500 come from?
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