Diameter of a circle – Geometry

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Parts of a circle

The geometry of a circle

The diameter of a circle is the distance across the circle at the widest part of the circle. The diameter is always equal to twice the radius of the circle, because the radius starts from the center of the circle and goes straight to the edge.

Learn by doing: measure the diameter of some circles in your house
Area of a Circle
More about Geometry

Bibliography and further reading about circles:


More Geometry
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By | 2017-07-29T09:34:48+00:00 July 29th, 2017|Math|0 Comments
Cite this page: Carr, K.E. Diameter of a circle – Geometry. Quatr.us Study Guides, July 29, 2017. Web. December 13, 2017.

About the Author:

Karen Carr

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.

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