Enneagrammic-decagonal duoprism

The enneagrammic-decagonal duoprism, also known as stededip or the 9/2-10 duoprism, is a uniform duoprism that consists of 10 enneagrammic prisms and 9 decagonal prisms, with 2 of each meeting at each vertex.

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

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


 * (1, 0, ±sin(2π/9), ±sin(2π/9)$\sqrt{(5+√5)/2}$),
 * (1, 0, ±sin(2π/9)(3+$\sqrt{2}$)/2, ±sin(2π/9)$\sqrt{(3+√5)/2+1/[4sin^{2}(2π/9)]}$),
 * (1, 0, ±sin(2π/9)(1+$\sqrt{5+2√5}$), 0),
 * (cos(2π/9), ±sin(2π/9), ±sin(2π/9), ±sin(2π/9)$\sqrt{5+2√5}$),
 * (cos(2π/9), ±sin(2π/9), ±sin(2π/9)(3+$\sqrt{5}$)/2, ±sin(2π/9)$\sqrt{(5+√5)/2}$),
 * (cos(2π/9), ±sin(2π/9), ±sin(2π/9)(1+$\sqrt{5}$), 0),
 * (cos(4π/9), ±sin(4π/9), ±sin(2π/9), ±sin(2π/9)$\sqrt{5+2√5}$),
 * (cos(4π/9), ±sin(4π/9), ±sin(2π/9)(3+$\sqrt{5}$)/2, ±sin(2π/9)$\sqrt{(5+√5)/2}$),
 * (cos(4π/9), ±sin(4π/9), ±sin(2π/9)(1+$\sqrt{5}$), 0),
 * (–1/2, ±$\sqrt{5+2√5}$/2, ±sin(2π/9), ±sin(2π/9)$\sqrt{5}$),
 * (–1/2, ±$\sqrt{(5+√5)/2}$/2, ±sin(2π/9)(3+$\sqrt{5}$)/2, ±sin(2π/9)$\sqrt{3}$),
 * (–1/2, ±$\sqrt{5+2√5}$/2, ±sin(2π/9)(1+$\sqrt{3}$), 0),
 * (cos(8π/9), ±sin(8π/9), ±sin(2π/9), ±sin(2π/9)$\sqrt{5}$),
 * (cos(8π/9), ±sin(8π/9), ±sin(2π/9)(3+$\sqrt{(5+√5)/2}$)/2, ±sin(2π/9)$\sqrt{3}$),
 * (cos(8π/9), ±sin(8π/9), ±sin(2π/9)(1+$\sqrt{5}$), 0).