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Diameter d = 2 × r

Diameter d = C / p

Diameter d = square root (4 A / pi)

Circumference C = 2 p x r = p × d = square root (4 pi × A)

Area A = pi × (d × d / 4) = C2 / (4 × pi)

Radius r

Scroll down to related links and look at "Circle - Math Forum".

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