Torus

The Torus is basically a donut, or inner-tube.  The first step to creating a Torus is selecting the center point. Next you will be asked for the radius of the Torus. This radius is the distance from the center point to the center line of the actual Torus. If you think of the Torus cross-sectionally, it would be the distance from the center of the Torus to the center of the circle we would see in the cross-section. Lastly, you will have to choose the tube radius, or the radius of the actual tube.

As with many other AutoCAD commands, you can enter the diameter of the required information, rather than the radius, by typing "d" into the command line.