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The area of a circle is (pi x radius squared) A = πr2

The circumference is (pi x diameter) C = π (2r)

So if you have the circumference,

the area is the circumference squared, divided by 4pi (about 12.566). A = C2/4π

Example:

A circle with a diameter of 6 inches has a radius of 3 inches

Area A = pi (32) or about 28.27 square inches

Circumference C = pi (6) or about 18.85 inches

Using C2/4pi, the area is

18.85 x 18.85 / 12.566 = about 28.27 square inches

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Q: How do you find the area of a circle with the circumference?
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