Extending Polylines in AutoCAD

You can extend only open polylines (unjoined first and last line or arc polyline segments). Either the first or the last edge extends as if it were a line or arc object.

Wide polylines extend so the centerline intersects the boundary. Because the ends of wide polylines are at a 90-degree angle, part of the end extends past the boundary if the boundary is not perpendicular to the extended segment. If you extend a tapered polyline segment, the width of the extended end is corrected to continue the original taper to the new endpoint. If this correction gives the segment a negative ending width, the ending width is forced to 0.

extending-polylines

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