Area of a Circle - Geometry Made Easy
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Area of a Circle


The area of a circle is the flat surface inside its circumference. The area is always equal to the radius squared, multiplied by π (pi).

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

Learn by doing: figure out the area of some circles around you.
Circumference of a Circle
More about Geometry

Bibliography and further reading about circles:

More about Geometry
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Copyright 2012-2015 Karen Carr, Portland State University. This page last updated September 2015.

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