Small hendecagram

The small hendecagram, or shen, is a polygon with 11 sides. It's created by taking the first stellation of a hendecagon. A regular small hendecagram has equal sides and equal angles.

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

Vertex coordinates
Coordinates for a heptagon of edge length 2sin(2π/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)).