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The area of a circle (A) is pi x r x r.

The circumference of a circle (C) is pi x d, or pi x 2r.

So if you know C, you can calculate r using the formula C = pi x 2r or r = C/2pi

Once you know r, you can calculate A using the formula A = pi x r x r

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Q: How do you calculate the area from the circumference?
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