It depends on what geometry you talk about.
For example if for a square:
the side length, L, equals circumference divided by four. Then the area = L x L
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It depends on what you want to convert the area of the circle into.
You can not CONVERT. Circumference is a measure of length and square inches is a measure of Area. However, if you know the circumference of a circle, you can FIND the area.for example:Circumference = pi x (2 x radius)solve for the radius = C/2pi,then Area = pi x r2 .You can do the same 'type' of calculation for Polygons, BUT you must know the lengths of the individual sides, not just the total circumference.
Circumference = 2*pi*radius Radius = Circumference/(2*pi)
You cannot.
28.26=area 18.84=circumference