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{{Semireg polyhedra db|Semireg polyhedron stat table|tC}} | |||
In [[geometry]], the '''truncated cube''', or '''truncated hexahedron''', is an [[Archimedean solid]]. It has 14 regular faces (6 [[octagon]]al and 8 [[triangle (geometry)|triangular]]), 36 edges, and 24 vertices. | |||
If the truncated cube has unit edge length, its dual [[triakis octahedron]] has edges of lengths 2 and <math>\scriptstyle {2+\sqrt{2}}</math>. | |||
==Area and volume== | |||
The area ''A'' and the [[volume]] ''V'' of a truncated cube of edge length ''a'' are: | |||
:<math>A = 2\left(6+6\sqrt{2}+\sqrt{3}\right)a^2 \approx 32.4346644a^2</math> | |||
:<math>V = \frac{1}{3}\left(21+14\sqrt{2}\right)a^3 \approx 13.5996633a^3.</math> | |||
==Orthogonal projections== | |||
The ''truncated cube'' has five special [[orthogonal projection]]s, centered, on a vertex, on two types of edges, and two types of faces: triangles, and octagons. The last two correspond to the B<sub>2</sub> and A<sub>2</sub> [[Coxeter plane]]s. | |||
{|class=wikitable width=640 | |||
|+ Orthogonal projections | |||
|- | |||
!Centered by | |||
!Vertex | |||
!Edge<br>3-8 | |||
!Edge<br>8-8 | |||
!Face<br>Octagon | |||
!Face<br>Triangle | |||
|- | |||
!Truncated<BR>cube | |||
|[[File:Cube t01 v.png|100px]] | |||
|[[File:Cube t01 e38.png|100px]] | |||
|[[File:Cube t01 e88.png|100px]] | |||
|[[File:3-cube t01_B2.svg|100px]] | |||
|[[File:3-cube t01.svg|100px]] | |||
|- | |||
![[Triakis octahedron|Triakis<BR>octahedron]] | |||
|[[File:Dual truncated cube t01 v.png|100px]] | |||
|[[File:Dual truncated cube t01 e8.png|100px]] | |||
|[[File:Dual truncated cube t01 e88.png|100px]] | |||
|[[File:Dual truncated cube t01_B2.png|100px]] | |||
|[[File:Dual truncated cube t01.png|100px]] | |||
|- align=center | |||
!Projective<BR>symmetry | |||
|[2] | |||
|[2] | |||
|[2] | |||
|[4] | |||
|[6] | |||
|} | |||
==Cartesian coordinates== | |||
The following [[Cartesian coordinates]] define the vertices of a [[Truncation (geometry)|truncated]] [[hexahedron]] centered at the origin with edge length 2ξ: | |||
:(±ξ, ±1, ±1), | |||
:(±1, ±ξ, ±1), | |||
:(±1, ±1, ±ξ) | |||
where ξ = <math>\scriptstyle {\sqrt2 - 1}</math> | |||
== Vertex arrangement== | |||
It shares the [[vertex arrangement]] with three [[nonconvex uniform polyhedra]]: | |||
{|class="wikitable" width="400" style="vertical-align:top;text-align:center" | |||
|[[Image:Truncated hexahedron.png|100px]]<br>Truncated cube | |||
|[[Image:Uniform great rhombicuboctahedron.png|100px]]<br>[[Nonconvex great rhombicuboctahedron]] | |||
|[[Image:Great cubicuboctahedron.png|100px]]<br>[[Great cubicuboctahedron]] | |||
|[[Image:Great rhombihexahedron.png|100px]]<br>[[Great rhombihexahedron]] | |||
|} | |||
==Related polyhedra== | |||
The truncated cube is one of a family of uniform polyhedra related to the cube and regular octahedron. | |||
{{Octahedral truncations}} | |||
This polyhedron is topologically related as a part of sequence of uniform [[Truncation (geometry)|truncated]] polyhedra with [[vertex configuration]]s (3.2n.2n), and [n,3] [[Coxeter group]] symmetry. | |||
{{Truncated figure1 table}} | |||
It is topologically related to a series of polyhedra and tilings with [[face configuration]] V''n''.6.6. | |||
{{Truncated figure4 table}} | |||
=== Alternated truncation=== | |||
A cube can be [[Alternation (geometry)|alternately]] truncated producing [[tetrahedral symmetry]], with six hexagonal faces, and four triangles at the truncated vertices. It is one of a sequence of [[Truncated rhombic dodecahedron#related polyhedra|alternate truncations of polyhedra and tiling]]. | |||
:[[File:Alternate_truncated_cube.png|100px]] | |||
== Related polytopes == | |||
The ''[[Truncation (geometry)|truncated]] [[cube]]'', is second in a sequence of truncated [[hypercube]]s: | |||
{{Truncated hypercube polytopes}} | |||
==See also== | |||
*[[:Image:Truncatedhexahedron.gif|Spinning truncated cube]] | |||
*[[Cube-connected cycles]], a family of graphs that includes the [[skeleton (topology)|skeleton]] of the truncated cube | |||
==References== | |||
*{{The Geometrical Foundation of Natural Structure (book)}} (Section 3-9) | |||
* Cromwell, P. ''Polyhedra'', CUP hbk (1997), pbk. (1999). Ch.2 p.79-86 ''Archimedean solids'' | |||
==External links== | |||
*{{mathworld2 |urlname=TruncatedCube |title=Truncated cube |urlname2=ArchimedeanSolid |title2=Archimedean solid}} | |||
*{{KlitzingPolytopes|polyhedra.htm|3D convex uniform polyhedra|o3x4x - tic}} | |||
*[http://www.dr-mikes-math-games-for-kids.com/polyhedral-nets.html?net=621wh65c7Ey8v4cRpEVhGs0pPxZ5raM9uNf8HcBUgOyrp6acSwZGvkvEcL6m06RDKxmSAduYsvTvoCvEDokvHrjyVEqlGVdIH8WamnxFO1qnGpUtgt7K0ZD57RlX&name=Truncated+Cube#applet Editable printable net of a truncated cube with interactive 3D view] | |||
*[http://www.mathconsult.ch/showroom/unipoly/ The Uniform Polyhedra] | |||
*[http://www.georgehart.com/virtual-polyhedra/vp.html Virtual Reality Polyhedra] www.georgehart.com: The Encyclopedia of Polyhedra | |||
**[[VRML]] [http://www.georgehart.com/virtual-polyhedra/vrml/truncated_cube.wrl model] | |||
**[http://www.georgehart.com/virtual-polyhedra/conway_notation.html Conway Notation for Polyhedra] Try: "tC" | |||
{{Archimedean solids}} | |||
{{Polyhedron navigator}} | |||
{{Polyhedron-stub}} | |||
[[Category:Uniform polyhedra]] | |||
[[Category:Archimedean solids]] | |||
Revision as of 14:21, 31 January 2014
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In geometry, the truncated cube, or truncated hexahedron, is an Archimedean solid. It has 14 regular faces (6 octagonal and 8 triangular), 36 edges, and 24 vertices.
If the truncated cube has unit edge length, its dual triakis octahedron has edges of lengths 2 and .
Area and volume
The area A and the volume V of a truncated cube of edge length a are:
Orthogonal projections
The truncated cube has five special orthogonal projections, centered, on a vertex, on two types of edges, and two types of faces: triangles, and octagons. The last two correspond to the B2 and A2 Coxeter planes.
| Centered by | Vertex | Edge 3-8 |
Edge 8-8 |
Face Octagon |
Face Triangle |
|---|---|---|---|---|---|
| Truncated cube |
File:Cube t01 v.png | File:Cube t01 e38.png | File:Cube t01 e88.png | File:3-cube t01 B2.svg | File:3-cube t01.svg |
| Triakis octahedron |
File:Dual truncated cube t01 v.png | File:Dual truncated cube t01 e8.png | File:Dual truncated cube t01 e88.png | File:Dual truncated cube t01 B2.png | File:Dual truncated cube t01.png |
| Projective symmetry |
[2] | [2] | [2] | [4] | [6] |
Cartesian coordinates
The following Cartesian coordinates define the vertices of a truncated hexahedron centered at the origin with edge length 2ξ:
- (±ξ, ±1, ±1),
- (±1, ±ξ, ±1),
- (±1, ±1, ±ξ)
Vertex arrangement
It shares the vertex arrangement with three nonconvex uniform polyhedra:
Related polyhedra
The truncated cube is one of a family of uniform polyhedra related to the cube and regular octahedron.
Template:Octahedral truncations
This polyhedron is topologically related as a part of sequence of uniform truncated polyhedra with vertex configurations (3.2n.2n), and [n,3] Coxeter group symmetry. Template:Truncated figure1 table
It is topologically related to a series of polyhedra and tilings with face configuration Vn.6.6. Template:Truncated figure4 table
Alternated truncation
A cube can be alternately truncated producing tetrahedral symmetry, with six hexagonal faces, and four triangles at the truncated vertices. It is one of a sequence of alternate truncations of polyhedra and tiling.
Related polytopes
The truncated cube, is second in a sequence of truncated hypercubes:
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See also
- Spinning truncated cube
- Cube-connected cycles, a family of graphs that includes the skeleton of the truncated cube
References
- Template:The Geometrical Foundation of Natural Structure (book) (Section 3-9)
- Cromwell, P. Polyhedra, CUP hbk (1997), pbk. (1999). Ch.2 p.79-86 Archimedean solids
External links
- Template:Mathworld2
- Template:KlitzingPolytopes
- Editable printable net of a truncated cube with interactive 3D view
- The Uniform Polyhedra
- Virtual Reality Polyhedra www.georgehart.com: The Encyclopedia of Polyhedra
- VRML model
- Conway Notation for Polyhedra Try: "tC"
Template:Archimedean solids Template:Polyhedron navigator Template:Polyhedron-stub