Circumference - Geometry Made Easy
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Circumference of a Circle

Radius
Circumference of a circle

The circumference of a circle is the distance all the way around the circle. It's the same as the perimeter, but a special word that we only use for the perimeter of a circle. The circumference is always equal to twice the radius of the circle times π (pi), or 2πr.

Here's a proof that this is always true for any circle.

Learn by doing: figure out the circumference of a plate in your kitchen.
Radius
Diameter
Area of a Circle
More about Geometry

Bibliography and further reading about circles:

More Geometry
More about Math
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Karen Carr is Associate Professor Emerita, Department of History, Portland State University. She holds a doctorate in Classical Art and Archaeology from the University of Michigan. Follow her on Instagram or Twitter, or buy her book, Vandals to Visigoths.
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