SOLUTION: Express the A area of a circle as a function of its circumference C.

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Question 1007283: Express the A area of a circle as a function of its circumference C.
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Since C = 2(pi)r and A = (pi)r^2, let's solve for r in the first one and plug it in to the second...we get
r = C / 2pi
so that
A = (pi)(C / 2(pi))^2 = C^2 / 4(pi)