If the angle is more or less than 90 degrees, AutoCAD must give you concentric shapes with shorter or longer sides, since the perimeter of your object is changing in area contained. What the corner angle has to do with it is simple geometry. However, the resulting copy will have line segments that may be shortened or lengthened by the distance of the offset unless your corner angle is precisely 90 degrees. If your original line construct is made of a polyline, one offset command will give you a copy of the original, located the offset distance away, in the direction of your cursor move during the command execution. Depending on which direction the offset is done, the resulting two lines will either be crossed or separated at the inner "corner" unless you are able to direct your cursor precisely 45 deg in the NE or the SW direction while offsetting each line segment. The result will be one line offset from each original by a distance. ![]() ![]() In the case of your two lines, if they are not a polyline, you will need to do two offsets. Offset can only act on one object at a time. The offset command is intended to provide a rapid way to establish multiple concentric polygons or parallel lines. Come to think of it, I am not sure the resulting offset line segments will not change in length, even if the corner angle is 90 deg exactly. It doesn't matter whether your lines form a closed or open shape. ![]() Sorry, you'll have to look them up with the F1 key. Use "Copy Selection" or "Copy with base point".
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