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Divide the area by pi. Find the square root of your result. Multiply this by 2. Now multiply this by pi. There is your circumference.

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13y ago
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13y ago

A = pi*r^2, C = 2*pi*r. Since you know circumference, r = C/2/pi, so A = pi*(C/2/pi)^2 = C2 / (4*pi)

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Q: How do you find area from circumference?
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