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, Pinterest, or Twitter, or buy her book, Vandals to Visigoths.
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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