Grand hendecagrammic-dodecagrammic duoprism

Grand hendecagrammic-dodecagrammic duoprism
	(OFF file)
Rank	4
Type	Uniform
Notation
Coxeter diagram	x11/5o x12/5o ()
Elements
Cells	12 grand hendecagrammic prisms, 11 dodecagrammic prisms
Faces	132 squares, 12 grand hendecagrams, 11 dodecagrams
Edges	132+132
Vertices	132
Vertex figure	Digonal disphenoid, edge lengths 2cos(5π/11) (base 1), (√6–√2)/2 (base 2), √2 (sides)
Measures (edge length 1)
Circumradius
Hypervolume
Dichoral angles	Gashenp–4–stwip: 90°
	Gashenp–11/5–gashenp: 30°
	Stwip–12/5–stwip:
Central density	25
Number of external pieces	46
Level of complexity	24
Related polytopes
Army	Semi-uniform hentwadip
Dual	Grand hendecagrammic-dodecagrammic duotegum
Conjugates	Hendecagonal-dodecagonal duoprism, Hendecagonal-dodecagrammic duoprism, Small hendecagrammic-dodecagonal duoprism, Small hendecagrammic-dodecagrammic duoprism, Hendecagrammic-dodecagonal duoprism, Hendecagrammic-dodecagrammic duoprism, Great hendecagrammic-dodecagonal duoprism, Great hendecagrammic-dodecagrammic duoprism, Grand hendecagrammic-dodecagonal duoprism
Abstract & topological properties
Flag count	3168
Euler characteristic	0
Orientable	Yes
Properties
Symmetry	I2(11)×I2(12), order 528
Convex	No
Nature	Tame

The grand hendecagrammic-dodecagrammic duoprism, also known as the 11/5-12/5 duoprism, is a uniform duoprism that consists of 12 grand hendecagrammic prisms and 11 dodecagrammic prisms, with 2 of each at each vertex.

Coordinates[edit | edit source]

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

$\left(1,\,0,\,\pm \left({\sqrt {3}}-1\right)\sin {\frac {5\pi }{11}},\,\pm \left({\sqrt {3}}-1\right)\sin {\frac {5\pi }{11}}\right)$ ,
$\left(1,\,0,\,\pm \sin {\frac {5\pi }{11}},\,\pm \left(2-{\sqrt {3}}\right)\sin {\frac {5\pi }{11}}\right)$ ,
$\left(1,\,0,\,\pm \left(2-{\sqrt {3}}\right)\sin {\frac {5\pi }{11}},\,\pm \sin {\frac {5\pi }{11}}\right)$ ,
$\left(\cos \left({\frac {j\pi }{11}}\right),\,\pm \sin \left({\frac {j\pi }{11}}\right),\,\pm \left({\sqrt {3}}-1\right)\sin {\frac {5\pi }{11}},\,\pm \left({\sqrt {3}}-1\right)\sin {\frac {5\pi }{11}}\right)$ ,
$\left(\cos \left({\frac {j\pi }{11}}\right),\,\pm \sin \left({\frac {j\pi }{11}}\right),\,\pm \sin {\frac {5\pi }{11}},\,\pm \left(2-{\sqrt {3}}\right)\sin {\frac {5\pi }{11}}\right)$ ,
$\left(\cos \left({\frac {j\pi }{11}}\right),\,\pm \sin \left({\frac {j\pi }{11}}\right),\,\pm \left(2-{\sqrt {3}}\right)\sin {\frac {5\pi }{11}},\,\pm \sin {\frac {5\pi }{11}}\right)$ ,