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The circumference of a circle is equal to C = pi * diameter
The area of of a circle is equal to A = pi * radius squared, where the radius is 1/2 the diameter.
So the formula for finding the area would be A = C2/4 pi(circumference squared divided by 4 pi).
Example
A circle 2 meters wide has a circumference of 2 pi and a radius 1 meter.
A = pi r2 = 3.1416 m2
A = c2 / 4 pi = (2 pi)2 / 4 pi = 4 pi2 / 4 pi = 3.1416 m2
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