Enneagonal-hendecagrammic duoprism

The enneagonal-hendecagrammic duoprism, also known as the 9-11/3 duoprism, is a uniform duoprism that consists of 11 enneagonal prisms and 9 hendecagrammic prisms, with 2 of each meeting at each vertex.

The name can also refer to the enneagonal-small hendecagrammic duoprism, enneagonal-great hendecagrammic duoprism, or the enneagonal-grand hendecagrammic duoprism.

Vertex coordinates
The coordinates of a enneagonal-hendecagrammic duoprism, centered at the origin and with edge length 4sin(π/9)sin(3π/11), are given by:
 * (2sin(3π/11), 0, 2sin(π/9), 0),
 * (2sin(3π/11), 0, 2sin(π/9)cos(2π/11), ±2sin(π/9)sin(2π/11)),
 * (2sin(3π/11), 0, 2sin(π/9)cos(4π/11), ±2sin(π/9)sin(4π/11)),
 * (2sin(3π/11), 0, 2sin(π/9)cos(6π/11), ±2sin(π/9)sin(6π/11)),
 * (2sin(3π/11), 0, 2sin(π/9)cos(8π/11), ±2sin(π/9)sin(8π/11)),
 * (2sin(3π/11), 0, 2sin(π/9)cos(10π/11), ±2sin(π/9)sin(10π/11)),
 * (2sin(3π/11)cos(2π/9), ±2sin(3π/11)sin(2π/9), 2sin(π/9), 0),
 * (2sin(3π/11)cos(2π/9), ±2sin(3π/11)sin(2π/9), 2sin(π/9)cos(2π/11), ±2sin(π/9)sin(2π/11)),
 * (2sin(3π/11)cos(2π/9), ±2sin(3π/11)sin(2π/9), 2sin(π/9)cos(4π/11), ±2sin(π/9)sin(4π/11)),
 * (2sin(3π/11)cos(2π/9), ±2sin(3π/11)sin(2π/9), 2sin(π/9)cos(6π/11), ±2sin(π/9)sin(6π/11)),
 * (2sin(3π/11)cos(2π/9), ±2sin(3π/11)sin(2π/9), 2sin(π/9)cos(8π/11), ±2sin(π/9)sin(8π/11)),
 * (2sin(3π/11)cos(2π/9), ±2sin(3π/11)sin(2π/9), 2sin(π/9)cos(10π/11), ±2sin(π/9)sin(10π/11)),
 * (2sin(3π/11)cos(4π/9), ±2sin(3π/11)sin(4π/9), 2sin(π/9), 0),
 * (2sin(3π/11)cos(4π/9), ±2sin(3π/11)sin(4π/9), 2sin(π/9)cos(2π/11), ±2sin(π/9)sin(2π/11)),
 * (2sin(3π/11)cos(4π/9), ±2sin(3π/11)sin(4π/9), 2sin(π/9)cos(4π/11), ±2sin(π/9)sin(4π/11)),
 * (2sin(3π/11)cos(4π/9), ±2sin(3π/11)sin(4π/9), 2sin(π/9)cos(6π/11), ±2sin(π/9)sin(6π/11)),
 * (2sin(3π/11)cos(4π/9), ±2sin(3π/11)sin(4π/9), 2sin(π/9)cos(8π/11), ±2sin(π/9)sin(8π/11)),
 * (2sin(3π/11)cos(4π/9), ±2sin(3π/11)sin(4π/9), 2sin(π/9)cos(10π/11), ±2sin(π/9)sin(10π/11)),
 * (–sin(3π/11), ±sin(3π/11)$\sqrt{2}$, 2sin(π/9), 0),
 * (–sin(3π/11), ±sin(3π/11)$\sqrt{3}$, 2sin(π/9)cos(2π/11), ±2sin(π/9)sin(2π/11)),
 * (–sin(3π/11), ±sin(3π/11)$\sqrt{3}$, 2sin(π/9)cos(4π/11), ±2sin(π/9)sin(4π/11)),
 * (–sin(3π/11), ±sin(3π/11)$\sqrt{3}$, 2sin(π/9)cos(6π/11), ±2sin(π/9)sin(6π/11)),
 * (–sin(3π/11), ±sin(3π/11)$\sqrt{3}$, 2sin(π/9)cos(8π/11), ±2sin(π/9)sin(8π/11)),
 * (–sin(3π/11), ±sin(3π/11)$\sqrt{3}$, 2sin(π/9)cos(10π/11), ±2sin(π/9)sin(10π/11)),
 * (2sin(3π/11)cos(8π/9), ±2sin(3π/11)sin(8π/9), 2sin(π/9), 0),
 * (2sin(3π/11)cos(8π/9), ±2sin(3π/11)sin(8π/9), 2sin(π/9)cos(2π/11), ±2sin(π/9)sin(2π/11)),
 * (2sin(3π/11)cos(8π/9), ±2sin(3π/11)sin(8π/9), 2sin(π/9)cos(4π/11), ±2sin(π/9)sin(4π/11)),
 * (2sin(3π/11)cos(8π/9), ±2sin(3π/11)sin(8π/9), 2sin(π/9)cos(6π/11), ±2sin(π/9)sin(6π/11)),
 * (2sin(3π/11)cos(8π/9), ±2sin(3π/11)sin(8π/9), 2sin(π/9)cos(8π/11), ±2sin(π/9)sin(8π/11)),
 * (2sin(3π/11)cos(8π/9), ±2sin(3π/11)sin(8π/9), 2sin(π/9)cos(10π/11), ±2sin(π/9)sin(10π/11)).