Grand hendecagram

The grand hendecagram, or gahn, is a polygon with 11 sides. A regular grand hendecagram has equal sides and equal angles.

It is one of four stellations of the hendecagram, the other three being the small hendecagram, the hendecagram, and the great hendecagram.

Vertex coordinates
Coordinates for a heptagon of edge length 2sin(5π/11), centered at the origin, are:


 * (1, 0),
 * (cos(2π/11), ±sin(2π/11)),
 * (cos(4π/11), ±sin(4π/11)),
 * (cos(6π/11), ±sin(6π/11)),
 * (cos(8π/11), ±sin(8π/11)),
 * (cos(10π/11), ±sin(10π/11)).