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Tip and Trick Detail
Quickly Creating a 90 Degree or Closed Corner
*Applies to: AutoCAD R12, 13, 14, 2000, 2000i, 2002, 2004 and 2005*

In AutoCAD there is two ways to create a 90 Degree Closed Corner or a Closed Corner at any angle as well.  The two commands that allow for this to happen is Fillet or Chamfer.  When the radius of a Fillet is set to 0, it can create a closed corner at the intersection point of two lines.  The Chamfer command needs the two distance values to be set at 0 each to achieve the same output.  Once one of the commands is set up you just simply pick the two lines you would like to create a closed corner from.

Command Line (Fillet):
Command: fillet
(TRIM mode) Current fillet radius = 0.5000
Polyline/Radius/Trim/<Select first object>: r
Enter fillet radius <0.5000>: 0

(TRIM mode) Current fillet radius = 0.0000
Polyline/Radius/Trim/<Select first object>:
Select second object:

Command Line (Chamfer):
Command: chamfer
(TRIM mode) Current chamfer Dist1 = 0.5000, Dist2 = 0.5000
Polyline/Distance/Angle/Trim/Method/<Select first line>: d
Enter first chamfer distance <0.5000>: 0
Enter second chamfer distance <0.0000>: 0

(TRIM mode) Current chamfer Dist1 = 0.0000, Dist2 = 0.0000
Polyline/Distance/Angle/Trim/Method/<Select first line>:
Select second line: