[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]