Talk:Decagram

The area of the decagram is not correct. Actually it is taken from https://bendwavy.org/klitzing/dimensions/polygons.htm and this is not the area which is given here, but the so-called weighted area (the definition is given - some regions are counted multiple times). It is easy to see that the given area is not correct because it is higher than pi*R² where R is the circumradius.