Circumference of a circle – Geometry

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Parts of a circle

The geometry 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.

dinner plate

Dinner plate – can you figure out the circumference of a plate in your kitchen?

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.
Area of a Circle
More about Geometry

Bibliography and further reading about circles:


More Geometry
More about Math home

By |2017-07-28T08:49:28+00:00July 28th, 2017|Math|0 Comments
Cite this page: Carr, K.E. Circumference of a circle – Geometry. Study Guides, July 28, 2017. Web. January 23, 2019.

About the Author:

Dr. 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 Facebook, or buy her book, Vandals to Visigoths.

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