Ditrigonal dodecadodecahedron
| Ditrigonal dodecadodecahedron | |
|---|---|
| File:Ditrigonal dodecadodecahedron.png | |
| Type | Uniform star polyhedron |
| Elements | F = 24, E = 60 V = 20 (χ = −16) |
| Faces by sides | 12{5}+12{5/2} |
| Coxeter diagram | Template:CDD |
| Wythoff symbol | 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 | File:Ditrigonal dodecadodecahedron vertfig.png (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,<templatestyles src="Fraction/styles.css" />5⁄2}, as a blended great dodecahedron, and Coxeter diagram Template:CDD. It has 4 Schwarz triangle equivalent constructions, for example Wythoff symbol 3 | <templatestyles src="Fraction/styles.css" />5⁄3 5, and Coxeter diagram File:Ditrigonal dodecadodecahedron cd.png.
Related polyhedra
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{<templatestyles src="Fraction/styles.css" />5⁄2,3} | b{5,<templatestyles src="Fraction/styles.css" />5⁄2} |
|---|---|---|
| Template:CDD = Template:CDD | Template:CDD = Template:CDD | File:Ditrigonal dodecadodecahedron cd.png = Template:CDD |
| File:Small ditrigonal icosidodecahedron.png Small ditrigonal icosidodecahedron |
File:Great ditrigonal icosidodecahedron.png Great ditrigonal icosidodecahedron |
File:Ditrigonal dodecadodecahedron.png Ditrigonal dodecadodecahedron |
| File:Dodecahedron.png Dodecahedron (convex hull) |
File:Compound of five cubes.png 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]
File:Uniform tiling 553-t1.png
See also
References
External links
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- ↑ The Regular Polyhedra (of index two) Template:Webarchive, David A. Richter