Triangular-hendecagonal duoprism

The triangular-hendecagonal duoprism or thendip, also known as the 3-11 duoprism, is a uniform duoprism that consists of 3 hendecagonal prisms and 11 triangular prisms, with 2 of each joining at each vertex. It can also be seen as a convex segmentochoron, being a hendecagon atop a hendecagonal prism.

Vertex coordinates
The vertex coordinates of a triangular-hendecagonal duoprism, centered at the origin and with edge length 2sin(π/11), are given by: where j = 2, 4, 6, 8, 10.
 * $$\left(0,\frac{2\sqrt3}3\sin\frac{\pi}{11},1,0\right),$$
 * $$\left(0,\frac{2\sqrt3}3\sin\frac{\pi}{11},\cos\left(\frac{j\pi}{11}\right),±\sin\left(\frac{j\pi}{11}\right)\right),$$
 * $$\left(±\sin\frac{\pi}{11},-\frac{\sqrt3}3\sin\frac{\pi}{11},1,0\right),$$
 * $$\left(±\sin\frac{\pi}{11},-\frac{\sqrt3}3\sin\frac{\pi}{11},\cos\left(\frac{j\pi}{11}\right),±\sin\left(\frac{j\pi}{11}\right)\right),$$