Use Circle to create closed circular splines made of four vertices.
All spline based shapes share the same General Parameters. See Splines for an explanation of these parameters.
The Circle uses the standard creation methods of Center or Edge. Most spline based shapes share the same Creation Method parameters. See Splines for an explanation of these parameters.
Once you have created a Circle, you can make changes using the following parameter:
Radius: Set this to specify the radius of the Circle.