Square-great heptagrammic duoprism

The square-great heptagrammic duoprism, also known as the 4-7/3 duoprism, is a uniform duoprism that consists of 7 cube s and 4 great heptagrammic prism s, with 2 of each meeting at each vertex.

Coordinates
The coordinates of a square-great heptagrammic duoprism, centered at the origin and with edge length 2sin(3π/7), are given by:


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