Use Circle to create closed circular splines made of four vertices.
Example of circle
To create a circle:
Most spline-based shapes share these parameters. For details, see Rendering rollout and Interpolation rollout.
The Circle shape offers the standard creation-method choice: Center or Edge. For details, see Creation Method rollout.
Creates a Circle spline from the keyboard. Use the X/Y/Z settings to specify the center point and the Radius setting to specify the radius, then click Create. After creating the spline, you can use the Parameters rollout control to adjust the radius (see following).
Once you have created a circle, you can change the value of the following setting:
The radius (center-to-edge distance) of the circle.