# Pentagrammic-grand hendecagrammic duoprism

(Redirected from 5/2-11/5 duoprism)
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Pentagrammic-grand hendecagrammic duoprism
Rank4
TypeUniform
SpaceSpherical
Info
Coxeter diagramx5/2o x11/5o
SymmetryH2×I2(11), order 220
ArmySemi-uniform pahendip
Elements
Vertex figureDigonal disphenoid, edge lengths (5–1)/2 (base 1), 2cos(5π/11) (base 2), 2 (sides)
Cells11 pentagrammic prisms, 5 grand hendecagrammic prisms
Faces55 squares, 11 pentagrams, 5 grand hendecagrams
Edges55+55
Vertices55
Measures (edge length 1)
Circumradius$\sqrt{\frac{5-\sqrt{5}}{10}+\frac{1}{4\sin^2\frac{5\pi}{11}}}≈0.72908$ Hypervolume$\frac{11\sqrt{5(5-2\sqrt{5})}}{16\tan\frac{5\pi}{11}}≈0.16059$ Dichoral anglesStip–5/2–stip: π/11 ≈ 16.36364°
11/5p–11/5–11/5p: 36°
Stip–4–11/5p: 90°
Central density10
Related polytopes
DualPentagrammic-grand hendecagrammic duotegum
ConjugatesPentagonal-hendecagonal duoprism, Pentagonal-small hendecagrammic duoprism, Pentagonal-hendecagrammic duoprism, Pentagonal-great hendecagrammic duoprism, Pentagonal-grand hendecagrammic duoprism, Pentagrammic-hendecagonal duoprism, Pentagrammic-small hendecagrammic duoprism, Pentagrammic-hendecagrammic duoprism, Pentagrammic-great hendecagrammic duoprism
Properties
ConvexNo
OrientableYes
NatureTame

The pentagrammic-grand hendecagrammic duoprism, also known as the 5/2-11/5 duoprism, is a uniform duoprism that consists of 11 pentagrammic prisms and 5 grand hendecagrammic prisms, with 2 of each meeting at each vertex.

## Vertex coordinates

The coordinates of a pentagrammic-grand hendecagrammic duoprism, centered at the origin and with edge length 2sin(5π/11), are given by:

• (±sin(5π/11), –sin(5π/11)(5–25)/5, 1, 0),
• (±sin(5π/11), –sin(5π/11)(5–25)/5, cos(2π/11), ±sin(2π/11)),
• (±sin(5π/11), –sin(5π/11)(5–25)/5, cos(4π/11), ±sin(4π/11)),
• (±sin(5π/11), –sin(5π/11)(5–25)/5, cos(6π/11), ±sin(6π/11)),
• (±sin(5π/11), –sin(5π/11)(5–25)/5, cos(8π/11), ±sin(8π/11)),
• (±sin(5π/11), –sin(5π/11)(5–25)/5, cos(10π/11), ±sin(10π/11)),
• (±sin(5π/11)(5–1)/2, sin(5π/11)(5+5)/10, 1, 0),
• (±sin(5π/11)(5–1)/2, sin(5π/11)(5+5)/10, cos(2π/11), ±sin(2π/11)),
• (±sin(5π/11)(5–1)/2, sin(5π/11)(5+5)/10, cos(4π/11), ±sin(4π/11)),
• (±sin(5π/11)(5–1)/2, sin(5π/11)(5+5)/10, cos(6π/11), ±sin(6π/11)),
• (±sin(5π/11)(5–1)/2, sin(5π/11)(5+5)/10, cos(8π/11), ±sin(8π/11)),
• (±sin(5π/11)(5–1)/2, sin(5π/11)(5+5)/10, cos(10π/11), ±sin(10π/11)),
• (0, –2sin(5π/11)(5–5)/10, 1, 0),
• (0, –2sin(5π/11)(5–5)/10, cos(2π/11), ±sin(2π/11)),
• (0, –2sin(5π/11)(5–5)/10, cos(4π/11), ±sin(4π/11)),
• (0, –2sin(5π/11)(5–5)/10, cos(6π/11), ±sin(6π/11)),
• (0, –2sin(5π/11)(5–5)/10, cos(8π/11), ±sin(8π/11)),
• (0, –2sin(5π/11)(5–5)/10, cos(10π/11), ±sin(10π/11)).