Ditrigonal dodecadodecahedron | |
---|---|
![]() | |
Type | Uniform star polyhedron |
Elements | F = 24, E = 60 V = 20 (χ = −16) |
Faces by sides | 12{5}+12{5/2} |
Coxeter diagram | ![]() ![]() ![]() ![]() |
Wythoff symbol | 3 | 5/3 5 3/2 | 5 5/2 3/2 | 5/3 5/4 3 | 5/2 5/4 |
Symmetry group | Ih, [5,3], *532 |
Index references | U41, C53, W80 |
Dual polyhedron | Medial triambic icosahedron |
Vertex figure |
![]() (5.5/3)3 |
Bowers acronym | Ditdid |
In
geometry, the
ditrigonal dodecadodecahedron (or ditrigonary dodecadodecahedron) is a
nonconvex uniform polyhedron, indexed as U41. It has 24 faces (12
pentagons and 12
pentagrams), 60 edges, and 20 vertices.
[1] It has extended
Schläfli symbol b{5,5⁄2}, as a blended great dodecahedron, and
Coxeter diagram . It has 4
Schwarz triangle equivalent constructions, for example
Wythoff symbol 3 | 5⁄3 5, and
Coxeter diagram
.
Its convex hull is a regular dodecahedron. It additionally shares its edge arrangement with the small ditrigonal icosidodecahedron (having the pentagrammic faces in common), the great ditrigonal icosidodecahedron (having the pentagonal faces in common), and the regular compound of five cubes.
a{5,3} | a{5⁄2,3} | b{5,5⁄2} |
---|---|---|
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() ![]() ![]() ![]() ![]() ![]() |
![]() Small ditrigonal icosidodecahedron |
![]() Great ditrigonal icosidodecahedron |
![]() Ditrigonal dodecadodecahedron |
![]() Dodecahedron ( convex hull) |
![]() Compound of five cubes |
Furthermore, it may be viewed as a facetted dodecahedron: the pentagrammic faces are inscribed in the dodecahedron's pentagons. Its dual, the medial triambic icosahedron, is a stellation of the icosahedron.
It is topologically equivalent to a quotient space of the hyperbolic order-6 pentagonal tiling, by distorting the pentagrams back into regular pentagons. As such, it is a regular polyhedron of index two: [2]
Ditrigonal dodecadodecahedron | |
---|---|
![]() | |
Type | Uniform star polyhedron |
Elements | F = 24, E = 60 V = 20 (χ = −16) |
Faces by sides | 12{5}+12{5/2} |
Coxeter diagram | ![]() ![]() ![]() ![]() |
Wythoff symbol | 3 | 5/3 5 3/2 | 5 5/2 3/2 | 5/3 5/4 3 | 5/2 5/4 |
Symmetry group | Ih, [5,3], *532 |
Index references | U41, C53, W80 |
Dual polyhedron | Medial triambic icosahedron |
Vertex figure |
![]() (5.5/3)3 |
Bowers acronym | Ditdid |
In
geometry, the
ditrigonal dodecadodecahedron (or ditrigonary dodecadodecahedron) is a
nonconvex uniform polyhedron, indexed as U41. It has 24 faces (12
pentagons and 12
pentagrams), 60 edges, and 20 vertices.
[1] It has extended
Schläfli symbol b{5,5⁄2}, as a blended great dodecahedron, and
Coxeter diagram . It has 4
Schwarz triangle equivalent constructions, for example
Wythoff symbol 3 | 5⁄3 5, and
Coxeter diagram
.
Its convex hull is a regular dodecahedron. It additionally shares its edge arrangement with the small ditrigonal icosidodecahedron (having the pentagrammic faces in common), the great ditrigonal icosidodecahedron (having the pentagonal faces in common), and the regular compound of five cubes.
a{5,3} | a{5⁄2,3} | b{5,5⁄2} |
---|---|---|
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() ![]() ![]() ![]() ![]() ![]() |
![]() Small ditrigonal icosidodecahedron |
![]() Great ditrigonal icosidodecahedron |
![]() Ditrigonal dodecadodecahedron |
![]() Dodecahedron ( convex hull) |
![]() Compound of five cubes |
Furthermore, it may be viewed as a facetted dodecahedron: the pentagrammic faces are inscribed in the dodecahedron's pentagons. Its dual, the medial triambic icosahedron, is a stellation of the icosahedron.
It is topologically equivalent to a quotient space of the hyperbolic order-6 pentagonal tiling, by distorting the pentagrams back into regular pentagons. As such, it is a regular polyhedron of index two: [2]