Controls how the TRIM and EXTEND commands determine cutting and boundary edges.
| Type: | Integer | 
| Saved in: | Registry | 
| Initial value: | 0 | 
|  
			  Value  | 
 
			  Description  | 
|---|---|
|  
			  0  | 
 
			  Uses the selected edge without any extensions  | 
|  
			  1  | 
 
			  Extends or trims the selected object to an imaginary extension of the cutting or boundary edge  | 
Lines, arcs, elliptical arcs, rays, and polylines are objects eligible for natural extension. The natural extension of a line or ray is an unbounded line (xline), an arc is a circle, and an elliptical arc is an ellipse. A polyline is broken down into its line and arc components, which are extended to their natural boundaries.