A polygon is a plane figure generated by a finite number of line segments connected. When
the initial and end line segments from the polygon are connected, the polygon defines a closed area.
When the polygon do not define a closed area, the properties from the polygon object are the same as a line object.
When the poligon defines a closed area, the Closed polygon check button from the polygon
properties panel is selected, the polygon object has the same propertias as a rectangle object.
Note
If the initial and the end line segments from the polygon are not connected when the Closed polygon check button
is selected, a new line segment which connects both segments will be automatically generated.
The polygon properties can be displayed from menu bar, by right click on one polygon edge/line,
from selection properties panel and using keyboard shortcut.