Square-hendecagonal duoprism

The square-hendecagonal duoprism or shendip, also known as the 4-11 duoprism, is a uniform duoprism that consists of 4 hendecagonal prisms and 11 cubes, with two of each joining at each vertex. It is also a convex segmentochoron, being the prism of the hendecagonal prism.

Vertex coordinates
The coordinates of a square-hendecagrammic duoprism, centered at the origin and with edge length 2sin(π/11), are given by:
 * (±sin(π/11), ±sin(π/11), 1, 0),
 * (±sin(π/11), ±sin(π/11), cos(2π/11), ±sin(2π/11)),
 * (±sin(π/11), ±sin(π/11), cos(4π/11), ±sin(4π/11)),
 * (±sin(π/11), ±sin(π/11), cos(6π/11), ±sin(6π/11)),
 * (±sin(π/11), ±sin(π/11), cos(8π/11), ±sin(8π/11)),
 * (±sin(π/11), ±sin(π/11), cos(10π/11), ±sin(10π/11)).