Enneagonal-hendecagonal duoprism

The enneagonal-hendecagonal duoprism or ehendip, also known as the 9-11 duoprism, is a uniform duoprism that consists of 9 hendecagonal prisms and 11 enneagonal prisms, with two of each joining at each vertex.

Vertex coordinates
The coordinates of an enneagonal-hendecagonal duoprism, centered at the origin and with edge length 4sin(π/9)sin(π/11), are given by: where j = 2, 4, 8 and k = 2, 4, 6, 8, 10.
 * $$\left(2\sin\frac\pi{11},0,2\sin\frac\pi9,0\right),$$
 * $$\left(2\sin\frac\pi{11},0,2\sin\frac\pi9\cos\left(\frac{k\pi}{11}\right),±2\sin\frac\pi9\sin\left(\frac{k\pi}{11}\right)\right),$$
 * $$\left(2\sin\frac\pi{11}\cos\left(\frac{j\pi}9\right),±2\sin\frac\pi{11}\sin\left(\frac{j\pi}9\right),2\sin\frac\pi9,0\right),$$
 * $$\left(2\sin\frac\pi{11}\cos\left(\frac{j\pi}9\right),±2\sin\frac\pi{11}\sin\left(\frac{j\pi}9\right),2\sin\frac\pi9\cos\left(\frac{k\pi}{11}\right),±2\sin\frac\pi9\sin\left(\frac{k\pi}{11}\right)\right),$$
 * $$\left(-\sin\frac\pi{11},±\sqrt3\sin\frac\pi{11},2\sin\frac\pi9,0\right),$$
 * $$\left(-\sin\frac\pi{11},±\sqrt3\sin\frac\pi{11},2\sin\frac\pi9\cos\left(\frac{k\pi}{11}\right),±2\sin\frac\pi9\sin\left(\frac{k\pi}{11}\right)\right),$$