This app calculates following key figures for any polygon:

Area
Center
Radius of inertia
Axial area moment of inertia
Axial moment of resistance for any polygon

The polygon is defined by any number of points and displayed graphically.
The selection of a point is also possible inside the graphic and also apparent there.
The polygon can be saved into a XML file and loaded from that.
The calculation result can be used further with copy and paste.