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The [[dihedral angle]]s for the [[edge-transitive]] polyhedra are: | |||
{| class="wikitable" | |||
|- align="center" | |||
! Picture | |||
! Name | |||
! [[Schläfli symbol|Schläfli<BR>symbol]] | |||
! [[Vertex configuration|Vertex/Face<BR>configuration]] | |||
! exact dihedral angle<BR>(radians) | |||
! approximate<BR>dihedral angle<BR>(degrees) | |||
|-align="center" | |||
! colspan=6 | [[Platonic solid]]s (regular convex) | |||
|- align="center" | |||
| [[Image:Tetrahedron.png|30px]] | |||
| align="left" | [[Tetrahedron]] | |||
| {3,3} | |||
| (3.3.3) | |||
| arccos(1/3) | |||
| 70.53° | |||
|- align="center" | |||
| [[Image:Hexahedron.png|30px]] | |||
| align="left" | [[Hexahedron]] or [[Cube (geometry)|Cube]] | |||
| {4,3} | |||
| (4.4.4) | |||
| π/2 | |||
| 90° | |||
|- align="center" | |||
| [[Image:Octahedron.png|30px]] | |||
| align="left" | [[Octahedron]] | |||
| {3,4} | |||
| (3.3.3.3) | |||
| π − arccos(1/3) | |||
| 109.47° | |||
|- align="center" | |||
| [[Image:Dodecahedron.png|30px]] | |||
| align="left" | [[Dodecahedron]] | |||
| {5,3} | |||
| (5.5.5) | |||
| π − arctan(2) | |||
| 116.56° | |||
|- align="center" | |||
| [[Image:Icosahedron.png|30px]] | |||
| align="left" | [[Icosahedron]] | |||
| {3,5} | |||
| (3.3.3.3.3) | |||
| π − arccos(√5/3) | |||
| 138.19° | |||
|-align="center" | |||
! colspan=6 | [[Kepler-Poinsot solid]]s (regular nonconvex) | |||
|- align="center" | |||
| [[Image:Small stellated dodecahedron.png|30px]] | |||
| align="left" |[[Small stellated dodecahedron]]||{5/2,5} | |||
| (5/2.5/2.5/2.5/2.5/2) | |||
| π − arctan(2) | |||
| 116.56° | |||
|- align="center" | |||
| [[Image:Great dodecahedron.png|30px]] | |||
| align="left" |[[Great dodecahedron]]||{5,5/2} | |||
| (5.5.5.5.5)/2 | |||
| arctan(2) | |||
| 63.435° | |||
|- align="center" | |||
| [[Image:Great stellated dodecahedron.png|30px]] | |||
| align="left" |[[Great stellated dodecahedron]]||{5/2,3} | |||
| (5/2.5/2.5/2) | |||
| arctan(2) | |||
| 63.435° | |||
|- align="center" | |||
| [[Image:Great icosahedron.png|30px]] | |||
| align="left" |[[Great icosahedron]]||{3,5/2} | |||
| (3.3.3.3.3)/2 | |||
| arcsin(2/3) | |||
| 41.810° | |||
|- align="center" | |||
! colspan=6 | [[Quasiregular polyhedron|Quasiregular polyhedra]] ([[Rectification (geometry)|Rectified regular]]) | |||
|- align="center" | |||
| [[Image:Uniform polyhedron-33-t1.png|30px]] | |||
| align="left" | [[Tetratetrahedron]] | |||
| r{3,3} | |||
| (3.3.3.3) | |||
| <math> \pi - \arccos{\left( \frac{1}{3} \right)} </math> | |||
| 109.47° | |||
|- align="center" | |||
| [[Image:Cuboctahedron.png|30px]] | |||
| align="left" | [[Cuboctahedron]] | |||
| r{3,4} | |||
| (3.4.3.4) | |||
| <math> \pi - \arccos{\left( \frac{1}{\sqrt{3}} \right)} </math> | |||
| 125.264° | |||
|- align="center" | |||
| [[Image:Icosidodecahedron.png|30px]] | |||
| align="left" | [[Icosidodecahedron]] | |||
| r{3,5} | |||
| (3.5.3.5) | |||
| <math> \pi - \arccos{ \left( \sqrt{ \frac{ (5 + 2\sqrt 5)}{15} } \right) } </math> | |||
| 142.623° | |||
|- align="center" | |||
| [[Image:Dodecadodecahedron.png|30px]] | |||
| align="left" | [[Dodecadodecahedron]] | |||
| r{5/2,5} | |||
| (5.5/2.5.5/2) | |||
| π arctan(2) | |||
| 116.56° | |||
|- align="center" | |||
| [[Image:Great icosidodecahedron.png|30px]] | |||
| align="left" | [[Great icosidodecahedron]] | |||
| r{5/2,3} | |||
| (3.5/2.3.5/2) | |||
| | |||
| | |||
|- align="center" | |||
! colspan=6 | Ditrigonal polyhedra | |||
|- align="center" | |||
| [[Image:Small ditrigonal icosidodecahedron.png|30px]] | |||
| align="left" | [[Small ditrigonal icosidodecahedron]] | |||
| a{5,3} | |||
| (3.5/2.3.5/2.3.5/2) | |||
| | |||
| | |||
|- align="center" | |||
| [[Image:Ditrigonal dodecadodecahedron.png|30px]] | |||
| align="left" | [[Ditrigonal dodecadodecahedron]] | |||
| b{5,5/2} | |||
| (5.5/3.5.5/3.5.5/3) | |||
| | |||
| | |||
|- align="center" | |||
| [[Image:Great ditrigonal icosidodecahedron.png|30px]] | |||
| align="left" | [[Great ditrigonal icosidodecahedron]] | |||
| c{3,5/2} | |||
| (3.5.3.5.3.5)/2 | |||
| | |||
| | |||
|- align="center" | |||
! colspan=6 | [[Hemipolyhedron|Hemipolyhedra]] | |||
|- align="center" | |||
| [[Image:Tetrahemihexahedron.png|30px]] | |||
| align="left" | [[Tetrahemihexahedron]] | |||
| o{3,3} | |||
| (3.4.3/2.4) | |||
| | |||
| 54.73° | |||
|- align="center" | |||
| [[Image:Cubohemioctahedron.png|30px]] | |||
| align="left" | [[Cubohemioctahedron]] | |||
| o{3,4} | |||
| (4.6.4/3.6) | |||
| | |||
| 54.73° | |||
|- align="center" | |||
| [[Image:Octahemioctahedron.png|30px]] | |||
| align="left" | [[Octahemioctahedron]] | |||
| o{4,3} | |||
| (3.6.3/2.6) | |||
| | |||
| 70.53° | |||
|- align="center" | |||
| [[Image:Small dodecahemidodecahedron.png|30px]] | |||
| align="left" | [[Small dodecahemidodecahedron]] | |||
| o{3,5} | |||
| (5.10.5/4.10) | |||
| | |||
| 26.063° | |||
|- align="center" | |||
| [[Image:Small icosihemidodecahedron.png|30px]] | |||
| align="left" | [[Small icosihemidodecahedron]] | |||
| o{5,3} | |||
| (3.10.3/2.10) | |||
| | |||
| 116.56° | |||
|- align="center" | |||
| [[Image:Great dodecahemicosahedron.png|30px]] | |||
| align="left" | [[Great dodecahemicosahedron]] | |||
| o{5/2,5} | |||
| (5.6.5/4.6) | |||
| | |||
| | |||
|- align="center" | |||
| [[Image:Small dodecahemicosahedron.png|30px]] | |||
| align="left" | [[Small dodecahemicosahedron]] | |||
| o{5,5/2} | |||
| (5/2.6.5/3.6) | |||
| | |||
| | |||
|- align="center" | |||
| [[Image:Great icosihemidodecahedron.png|30px]] | |||
| align="left" | [[Great icosihemidodecahedron]] | |||
| o{5/2,3} | |||
| (3.10/3.3/2.10/3) | |||
| | |||
| | |||
|- align="center" | |||
| [[Image:Great dodecahemidodecahedron.png|30px]] | |||
| align="left" | [[Great dodecahemidodecahedron]] | |||
| o{3,5/2} | |||
| (5/2.10/3.5/3.10/3) | |||
| | |||
| | |||
|- align="center" | |||
! colspan=6 | [[Polyhedron#Quasi-regular duals|Quasiregular dual solids]] | |||
|- align="center" | |||
| [[Image:Hexahedron.png|30px]] | |||
| align="left" | [[Cube|Rhombic hexahedron]]<BR>(Dual of tetratetrahedron) | |||
| - | |||
| V(3.3.3.3) | |||
| π − π/2 | |||
| 90° | |||
|- align="center" | |||
| [[Image:Rhombic dodecahedron.png|30px]] | |||
| align="left" | [[Rhombic dodecahedron]]<BR>(Dual of cuboctahedron) | |||
| - | |||
| V(3.4.3.4) | |||
| π − π/3 | |||
| 120° | |||
|- align="center" | |||
| [[Image:Rhombic triacontahedron.png|30px]] | |||
| align="left" | [[Rhombic triacontahedron]]<BR>(Dual of icosidodecahedron) | |||
| - | |||
| V(3.5.3.5) | |||
| π − π/5 | |||
| 144° | |||
|- align="center" | |||
| [[Image:DU36 medial rhombic triacontahedron.png|30px]] | |||
| align="left" | [[Medial rhombic triacontahedron]]<BR>(Dual of dodecadodecahedron) | |||
| - | |||
| V(5.5/2.5.5/2) | |||
| π π/3 | |||
| 120° | |||
|- align="center" | |||
| [[Image:DU54 great rhombic triacontahedron.png|30px]] | |||
| align="left" | [[Great rhombic triacontahedron]]<BR>(Dual of great icosidodecahedron) | |||
| - | |||
| V(3.5/2.3.5/2) | |||
| π π/(5/2) | |||
| 72° | |||
|- align="center" | |||
! colspan=6 | Duals of the ditrigonal polyhedra | |||
|- align="center" | |||
| [[Image:DU30 small triambic icosahedron.png|30px]] | |||
| align="left" | [[Small triambic icosahedron]]<BR>(Dual of small ditrigonal icosidodecahedron) | |||
| - | |||
| V(3.5/2.3.5/2.3.5/2) | |||
| | |||
| | |||
|- align="center" | |||
| [[Image:DU41 medial triambic icosahedron.png|30px]] | |||
| align="left" | [[Medial triambic icosahedron]]<BR>(Dual of ditrigonal dodecadodecahedron) | |||
| - | |||
| V(5.5/3.5.5/3.5.5/3) | |||
| | |||
| | |||
|- align="center" | |||
| [[Image:DU47 great triambic icosahedron.png|30px]] | |||
| align="left" | [[Great triambic icosahedron]]<BR>(Dual of great ditrigonal icosidodecahedron) | |||
| - | |||
| V(3.5.3.5.3.5)/2 | |||
| | |||
| | |||
|- align="center" | |||
! colspan=6 | [[Hemipolyhedron#Duals of the hemipolyhedra|Duals of the hemipolyhedra]] | |||
|- align="center" | |||
| [[Image:Tetrahemihexacron.png|30px]] | |||
| align="left" | [[Tetrahemihexacron]]<BR>(Dual of tetrahemihexahedron) | |||
| - | |||
| V(3.4.3/2.4) | |||
| π π/2 | |||
| 90° | |||
|- align="center" | |||
| [[Image:Hexahemioctacron.png|30px]] | |||
| align="left" | [[Hexahemioctacron]]<BR>(Dual of cubohemioctahedron) | |||
| - | |||
| V(4.6.4/3.6) | |||
| π π/3 | |||
| 120° | |||
|- align="center" | |||
| [[Image:Hexahemioctacron.png|30px]] | |||
| align="left" | [[Octahemioctacron]]<BR>(Dual of octahemioctahedron) | |||
| - | |||
| V(3.6.3/2.6) | |||
| π π/3 | |||
| 120° | |||
|- align="center" | |||
| [[Image:Small dodecahemidodecacron.png|30px]] | |||
| align="left" | [[Small dodecahemidodecacron]]<BR>(Dual of small dodecahemidodecacron) | |||
| - | |||
| V(5.10.5/4.10) | |||
| π π/5 | |||
| 144° | |||
|- align="center" | |||
| [[Image:Small dodecahemidodecacron.png|30px]] | |||
| align="left" | [[Small icosihemidodecacron]]<BR>(Dual of small icosihemidodecacron) | |||
| - | |||
| V(3.10.3/2.10) | |||
| π π/5 | |||
| 144° | |||
|- align="center" | |||
| [[Image:Small dodecahemicosacron.png|30px]] | |||
| align="left" | [[Great dodecahemicosacron]]<BR>(Dual of great dodecahemicosahedron) | |||
| - | |||
| V(5.6.5/4.6) | |||
| π π/3 | |||
| 120° | |||
|- align="center" | |||
| [[Image:Small dodecahemicosacron.png|30px]] | |||
| align="left" | [[Small dodecahemicosacron]]<BR>(Dual of small dodecahemicosahedron) | |||
| - | |||
| V(5/2.6.5/3.6) | |||
| π π/3 | |||
| 120° | |||
|- align="center" | |||
| [[Image:Great dodecahemidodecacron.png|30px]] | |||
| align="left" | [[Great icosihemidodecacron]]<BR>(Dual of great icosihemidodecacron) | |||
| - | |||
| V(3.10/3.3/2.10/3) | |||
| π π/(5/2) | |||
| 72° | |||
|- align="center" | |||
| [[Image:Great dodecahemidodecacron.png|30px]] | |||
| align="left" | [[Great dodecahemidodecacron]]<BR>(Dual of great dodecahemidodecacron) | |||
| - | |||
| V(5/2.10/3.5/3.10/3) | |||
| π π/(5/2) | |||
| 72° | |||
|} | |||
== References == | |||
* [[Coxeter]], ''Regular Polytopes'' (1963), Macmillian Company | |||
** ''Regular Polytopes'', (3rd edition, 1973), Dover edition, ISBN 0-486-61480-8 (Table I: Regular Polytopes, (i) The nine regular polyhedra {p,q} in ordinary space) | |||
* {{The Geometrical Foundation of Natural Structure (book)}} (Section 3-7 to 3-9) | |||
* {{MathWorld |title=Uniform Polyhedron |id=UniformPolyhedron}} | |||
[[Category:Polyhedra]] | |||
Revision as of 21:06, 20 February 2013
The dihedral angles for the edge-transitive polyhedra are:
References
- Coxeter, Regular Polytopes (1963), Macmillian Company
- Regular Polytopes, (3rd edition, 1973), Dover edition, ISBN 0-486-61480-8 (Table I: Regular Polytopes, (i) The nine regular polyhedra {p,q} in ordinary space)
- Template:The Geometrical Foundation of Natural Structure (book) (Section 3-7 to 3-9)
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