AutoCAD 2008 User's Guide > Create Realistic Images and Graphics > Draw 2D Isometric Views > 
Draw Isometric Circles
Concept Procedure Quick Reference
 
 
 

Represent circles on isometric planes using ellipses.

If you are drawing on isometric planes, use an ellipse to represent a circle viewed from an oblique angle. The easiest way to draw an ellipse with the correct shape is to use the Isocircle option of ELLIPSE. The Isocircle option is available only when the Style option of Snap mode is set to Isometric (see DSETTINGS).

NoteTo represent concentric circles, draw another ellipse with the same center rather than offsetting the original ellipse. Offsetting produces an oval-shaped spline that does not represent foreshortened distances as you would expect.