[23] Polylines
[23.1] How to access polyline VERTICES?
[23.2] How to JOIN multiple lines to polylines?
[23.3] Change WIDTH of multiple polylines
[23.4] Create a polyline or spline: with (ENTMAKE) or (COMMAND)
[23.5] How to calculate the LENGTH of polylines?
[23.6] How to revert the polyline direction?
[23.7] How to get the CENTER of a polyline?
[24] Circle/Arc Geometry: BULGE conversion, some trigonometry