# Hexagonal-hendecagonal duoprism

(Redirected from 6-11 duoprism)
Hexagonal-hendecagonal duoprism
Rank4
TypeUniform
SpaceSpherical
Bowers style acronymHahendip
Info
Coxeter diagramx6o x11o
SymmetryG2×I2(11), order 264
ArmyHahendip
RegimentHahendip
Elements
Vertex figureDigonal disphenoid, edge lengths 3 (base 1), 2cos(π/11) (base 2), and 2 (sides)
Cells11 hexagonal prisms, 6 hendecagonal prisms
Faces66 squares, 11 hexagons, 6 hendecagons
Edges66+66
Vertices66
Measures (edge length 1)
Circumradius$\frac{\sqrt{4+\frac{1}{\sin^2\frac{\pi}{11}}}}{2} ≈ 2.03708$ Hypervolume$\frac{33\sqrt3}{8\tan\frac{\pi}{11}} ≈ 24.33265$ Dichoral anglesHip–6–hip: $\frac{8\pi}{11} ≈ 147.27273°$ Henp–11–Henp: 120°
Hip–4–henp: 90°
Central density1
Euler characteristic0
Number of pieces17
Level of complexity6
Related polytopes
DualHexagonal-hendecagonal duotegum
ConjugatesHexagonal-small hendecagrammic duoprism, Hexagonal-hendecagrammic duoprism, Hexagonal-great hendecagrammic duoprism, Hexagonal-grand hendecagrammic duoprism
Properties
ConvexYes
OrientableYes
NatureTame

The hexagonal-hendecagonal duoprism or hahendip, also known as the 6-11 duoprism, is a uniform duoprism that consists of 6 hendecagonal prisms and 11 hexagonal prisms, with two of each joining at each vertex.

## Vertex coordinates

The coordinates of a hexagonal-hendecagonal duoprism, centered at the origin and with edge length 2sin(π/11), are given by:

• (±2sin(π/11), 0, 1, 0),
• (±2sin(π/11), 0, cos(2π/11), ±sin(2π/11)),
• (±2sin(π/11), 0, cos(4π/11), ±sin(4π/11)),
• (±2sin(π/11), 0, cos(6π/11), ±sin(6π/11)),
• (±2sin(π/11), 0, cos(8π/11), ±sin(8π/11)),
• (±2sin(π/11), 0, cos(10π/11), ±sin(10π/11)),
• (±sin(π/11), ±sin(π/11)3, 1, 0),
• (±sin(π/11), ±sin(π/11)3, cos(2π/11), ±sin(2π/11)),
• (±sin(π/11), ±sin(π/11)3, cos(4π/11), ±sin(4π/11)),
• (±sin(π/11), ±sin(π/11)3, cos(6π/11), ±sin(6π/11)),
• (±sin(π/11), ±sin(π/11)3, cos(8π/11), ±sin(8π/11)),
• (±sin(π/11), ±sin(π/11)3, cos(10π/11), ±sin(10π/11)).

## Representations

A hexagonal-hendecagonal duoprism has the following Coxeter diagrams:

• x6o x11o (full symmetry)
• x3x x11o (hexagons as ditrigons)