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Circle Geometry

A circle is a shape containing a set of points that are all the same distance from its center.

A circle has some important dimensions: the radius, the diameter and the circumference. It also has an area, which is the amount of space contained by a circle.

This widget allows you to find the radius, diameter, circumference and area of a circle.

Learn About Circle Geometry

Draw a circle by:

  • Clicking on the canvas, or
  • Entering any dimension.

Dimensions of the Circle

= 2 × radius

= 2 × π × radius

= π × radius2