Circle Geometry Widget

Learn about 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.

Interactive Widget

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

Draw a circle by:

Clicking on the canvas, or
Entering any dimension.

Radius:

Diameter:

= 2 × radius

Circumference:

= 2 × π × radius

Area:

= π × radius²

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