[page:Geometry] →

# [name]

CircleGeometry is a simple shape of Euclidean geometry. It is contructed from a number of triangular segments that are oriented around a central point and extend as far out as a given radius. It is built counter-clockwise from a start angle and a given central angle. It can also be used to create regular polygons, where the number of segments determines the number of sides.

## Example

`var material = new THREE.MeshBasicMaterial({ color: 0x0000ff }); var radius = 5; var segments = 32; var circleGeometry = new THREE.CircleGeometry( radius, segments ); var circle = new THREE.Mesh( circleGeometry, material ); scene.add( circle );`

## Constructor

### [name]([page:Float radius], [page:Integer segments], [page:Float thetaStart], [page:Float thetaLength])

radius — Radius of the circle, default = 50.
segments — Number of segments (triangles), minimum = 3, default = 8.
thetaStart — Start angle for first segment, default = 0 (three o'clock position).
thetaLength — The central angle, often called theta, of the circular sector. The default is 2*Pi, which makes for a complete circle.

## Source

[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]