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Circle Calculator

Calculate Area (A) and Circumference (C) from Radius (r) or Diameter (d).

Input Type

Value

Radius (r)	--
Diameter (d)	--
Circumference (C)	--
Area (A)	--

Circle Formulas

Diameter: d = 2r

Circumference: C = 2πr = πd

Area: A = πr²

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