Triangular-heptagrammic duoprism

The triangular-heptagrammic duoprism, also known as the 3-7/2 duoprism, is a uniform duoprism that consists of 7 triangular prism s and 3 heptagrammic prism s. with two of them at each vertex.

Coordinates
The coordinates of a triangular-heptagrammic duoprism, centered at the origin and with edge length 2sin(2π/7), are given by:


 * (0, 2sin(2π/7)*√3/3, 1, 0),
 * (0, 2sin(2π/7)*√3/3, cos(2π/7), ±sin(2π/7)),
 * (0, 2sin(2π/7)*√3/3, cos(4π/7), ±sin(4π/7)),
 * (0, 2sin(2π/7)*√3/3, cos(6π/7), ±sin(6π/7)),
 * (±sin(2π/7), –sin(2π/7)*√3/3, 1, 0),
 * (±sin(2π/7), –sin(2π/7)*√3/3, cos(2π/7), ±sin(2π/7)),
 * (±sin(2π/7), –sin(2π/7)*√3/3, cos(4π/7), ±sin(4π/7)),
 * (±sin(2π/7), –sin(2π/7)*√3/3, cos(6π/7), ±sin(6π/7)).