Triangular-hendecagonal duoprism

The triangular-hendecagonal duoprism or thendip, also known as the 3-11 duoprism, is a uniform duoprism that consists of 3 hendecagonal prisms and 11 triangular prisms, with 2 of each joining at each vertex. It can also be seen as a convex segmentochoron, being a hendecagon atop a hendecagonal prism.

Vertex coordinates
The vertex coordinates of a triangular-hendecagonal duoprism, centered at the origin and with edge length 2sin(π/11), are given by:
 * (±sin(π/11), –sin(π/11)$\sqrt{2}$/3, 1, 0),
 * (±sin(π/11), –sin(π/11)$\sqrt{3}$/3, cos(2π/11), ±sin(2π/11)),
 * (±sin(π/11), –sin(π/11)$\sqrt{3}$/3, cos(4π/11), ±sin(4π/11)),
 * (±sin(π/11), –sin(π/11)$\sqrt{3}$/3, cos(6π/11), ±sin(6π/11)),
 * (±sin(π/11), –sin(π/11)$\sqrt{3}$/3, cos(8π/11), ±sin(8π/11)),
 * (±sin(π/11), –sin(π/11)$\sqrt{3}$/3, cos(10π/11), ±sin(10π/11)),
 * (0, 2sin(π/11)$\sqrt{3}$/3, 1, 0),
 * (0, 2sin(π/11)$\sqrt{3}$/3, cos(2π/11), ±sin(2π/11)),
 * (0, 2sin(π/11)$\sqrt{3}$/3, cos(4π/11), ±sin(4π/11)),
 * (0, 2sin(π/11)$\sqrt{3}$/3, cos(6π/11), ±sin(6π/11)),
 * (0, 2sin(π/11)$\sqrt{3}$/3, cos(8π/11), ±sin(8π/11)),
 * (0, 2sin(π/11)$\sqrt{3}$/3, cos(10π/11), ±sin(10π/11)).