Rigid Polygon is a polygon that can only be rotated and
translated. Its shape cannot be altered.
It is drawn in the same way as an ordinary polygon: the tool is selected and then at least three points which will be the vertices of the polygon must be selected and then the first point is clicked again.
A Vector Polygon is a polygon where the first point presents the origin (the position of the other points is calculated according to this point).
It can be drawn in the same way as a Rigid Polygon.
With the PolyLine tool a polygonal line can be drawn.
Video presentation for the tools Rigid Polygon, Vector Polygon and PolyLine.
Source files for video presentation.