Editing polylines    

You can modify any type of two-dimensional or three-dimensional polyline. Entities such as rectangles, polygons, and donuts, as well as three-dimensional entities such as pyramids, cylinders, and spheres, are all variations of polylines that you can edit.    

You can edit a polyline by opening or closing it, by changing its overall width or the widths of individual segments, and by converting a polyline with straight line segments into a flowing curve or an approximation of a spline. In addition, you can use the Edit Polyline tool to edit individual vertices, adding, removing, or moving vertices. You can also add new segments to an existing polyline, change the linetypes of a polyline, and reverse the direction or order of the vertices.    

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Converting an entity to a polyline

Opening and closing polylines

Curving and decurving polylines

Joining polylines

Changing the polyline width

Editing polyline vertices

1. Converting an entity to a polyline
2. Opening and closing polylines
3. Curving and decurving polylines
4. Joining polylines
5. Changing the polyline width
6. Editing polyline vertices