# 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 × radius^{2}