Hendecagonal prism

The hendecagonal prism or henp is a prismatic uniform polyhedron. It consists of 2 hendecagons and 11 squares. Each vertex joins one hendecagon and two squares. As the name suggests, it is a prism based on a hendecagon.

Vertex coordinates
The coordinates of a hendecagonal prism, centered at the origin and with edge length 2sin(π/11), are given by:
 * $$\left(1,\,0,\,±\sin\frac\pi{11}\right),$$
 * $$\left(\cos\left(\frac{2\pi}{11}\right),\,±\sin\left(\frac{2\pi}{11}\right),\,±\sin\frac\pi{11}\right),$$
 * $$\left(\cos\left(\frac{4\pi}{11}\right),\,±\sin\left(\frac{4\pi}{11}\right),\,±\sin\frac\pi{11}\right),$$
 * $$\left(\cos\left(\frac{6\pi}{11}\right),\,±\sin\left(\frac{6\pi}{11}\right),\,±\sin\frac\pi{11}\right),$$
 * $$\left(\cos\left(\frac{8\pi}{11}\right),\,±\sin\left(\frac{8\pi}{11}\right),\,±\sin\frac\pi{11}\right),$$
 * $$\left(\cos\left(\frac{10\pi}{11}\right),\,±\sin\left(\frac{10\pi}{11}\right),\,±\sin\frac\pi{11}\right).$$