12-self-dual 12-gon
12-self dual 12-gon
The vertices , , ... , (in blue) can be chosen freely.
The vertices (in orange) must lie in the perpendicular space of :
can be chosen with degree 2 of freedom, while can only be chosen with degree 1 of freedom, and is then completely determined.
The rest of the vertices (in gray) are completely determined by the previous vertices.