Polygon
To draw a polygon:
1. Click Line in Geometry.
2. Click Polygon in Line.
3. Specify the start point, and then a sequence of end points.
Note that the result does not have to be a closed polygon. The lines are treated as individual elements and must therefore be deleted individually or enclosed in a box for deletion.
Once you have closed a polygon, you can continue by indicating the first point of a new polygon.