This application is intended to calculate the properties of polygonal sections (Area, Centroid, Moments of inertia, Products of Inertia, Angle between the translated axis
and the principal axis, ...).
The (x,y) coordinates of the vertices of the polygon (which must be located entirely
within the first quadrant) are input sequentially for a complete clockwise path around the polygon. Holes in the cross section, which do not intersect the boundary, may be deleted by following a counter-clockwise path.