Enneagrammic-dodecagrammic duoprism

The enneagrammic-dodecagrammic duoprism, also known as the 9/2-12/5 duoprism, is a uniform duoprism that consists of 12 enneagrammic prisms and 9 dodecagrammic prisms, with 2 of each meeting at each vertex.

The name can also refer to the great enneagrammic-dodecagrammic duoprism.

Coordinates
The vertex coordinates of an enneagrammic-dodecagrammic duoprism, centered at the origin and with edge length 2sin(2π/9), are given by:


 * (1, 0, ±sin(2π/9)($\sqrt{6}$–1), ±sin(2π/9)($\sqrt{2}$–1)),
 * (1, 0, ±sin(2π/9), ±sin(2π/9)(2–$\sqrt{2}$)),
 * (1, 0, ±sin(2π/9)(2–$\sqrt{3}$), ±sin(2π/9)),
 * (cos(2π/9), ±sin(2π/9), ±sin(2π/9)($\sqrt{3}$–1), ±sin(2π/9)($\sqrt{3}$–1)),
 * (cos(2π/9), ±sin(2π/9), ±sin(2π/9), ±sin(2π/9)(2–$\sqrt{3}$)),
 * (cos(2π/9), ±sin(2π/9), ±sin(2π/9)(2–$\sqrt{3}$), ±sin(2π/9)),
 * (cos(4π/9), ±sin(4π/9), ±sin(2π/9)($\sqrt{3}$–1), ±sin(2π/9)($\sqrt{3}$–1)),
 * (cos(4π/9), ±sin(4π/9), ±sin(2π/9), ±sin(2π/9)(2–$\sqrt{3}$)),
 * (cos(4π/9), ±sin(4π/9), ±sin(2π/9)(2–$\sqrt{3}$), ±sin(2π/9)),
 * (–1/2, ±$\sqrt{3}$/2, ±sin(2π/9)($\sqrt{3}$–1), ±sin(2π/9)($\sqrt{3}$–1)),
 * (–1/2, ±$\sqrt{3}$/2, ±sin(2π/9), ±sin(2π/9)(2–$\sqrt{3}$)),
 * (–1/2, ±$\sqrt{3}$/2, ±sin(2π/9)(2–$\sqrt{3}$), ±sin(2π/9)),
 * (cos(8π/9), ±sin(8π/9), ±sin(2π/9)($\sqrt{3}$–1), ±sin(2π/9)($\sqrt{3}$–1)),
 * (cos(8π/9), ±sin(8π/9), ±sin(2π/9), ±sin(2π/9)(2–$\sqrt{3}$)),
 * (cos(8π/9), ±sin(8π/9), ±sin(2π/9)(2–$\sqrt{3}$), ±sin(2π/9)).