Octagrammic-hendecagrammic duoprism

The octagrammic-hendecagrammic duoprism, also known as the 8/3-11/3 duoprism, is a uniform duoprism that consists of 11 octagrammic prisms and 8 hendecagrammic prisms, with 2 of each meeting at each vertex.

The name can also refer to the octagrammic-small hendecagrammic duoprism, the octagrammic-great hendecagrammic duoprism, or the octagrammic-grand hendecagrammic duoprism.

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