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Tip and Trick Detail
Create an Ellipse as a Polyline or an Ellipse Object
*Applies to: AutoCAD R13, 14, 2000, 2000i, 2002, 2004 and 2005*

The PELLIPSE system variable controls whether or not you create at Ellipse object as a set of Polylines or as a true Ellipse object.  When the value of PELLIPSE is set to 1, a true Ellipse object is created versus one created with Polyline segments if the value was set to 0.  One of the things that you will notice is that when working with a true Ellipse and you go to offset it, it will create the new Ellipse as a Spline.  This is untrue if you create the Ellipse with PELLIPSE set to 0 because when you go to offset it, the new offset object will be a Polyline like the original.

Note: You also can not use the lengthen command on a Spline object.