Truncated icosidodecahedron

Truncated icosidodecahedral graph
Truncated icosidodecahedral graph
	Hamiltonian, regular, zero-symmetric
	Table of graphs and parameters

Truncated icosidodecahedron
(Click here for rotating model)
Type	Archimedean solid Uniform polyhedron
Elements	F = 62, E = 180, V = 120 (χ = 2)
Faces by sides	30{4}+20{6}+12{10}
Conway notation	bD or taD
Schläfli symbols	tr{5,3} or $t{\begin{Bmatrix}5\\3\end{Bmatrix}}$
Schläfli symbols	t_0,1,2{5,3}
Wythoff symbol	2 3 5 \|
Coxeter diagram
Symmetry group	I_h, H₃, [5,3], (*532), order 120
Rotation group	I, [5,3]⁺, (532), order 60
Dihedral angle	6-10: 142.62° 4-10: 148.28° 4-6: 159.095°
References	U₂₈, C₃₁, W₁₆
Properties	Semiregular convex zonohedron
Colored faces	4.6.10 (Vertex figure)
Disdyakis triacontahedron (dual polyhedron)	Net

In geometry, a truncated icosidodecahedron, rhombitruncated icosidodecahedron,^[1] great rhombicosidodecahedron,^[2]^[3] omnitruncated dodecahedron or omnitruncated icosahedron^[4] is an Archimedean solid, one of thirteen convex, isogonal, non-prismatic solids constructed by two or more types of regular polygon faces.

It has 62 faces: 30

point symmetry (equivalently, 180° rotational symmetry), the truncated icosidodecahedron is a 15-zonohedron

.

Names

The name truncated icosidodecahedron, given originally by

topologically

equivalent to the Archimedean solid.

Alternate interchangeable names are:

Truncated icosidodecahedron (Johannes Kepler)
Rhombitruncated icosidodecahedron (Magnus Wenninger^[1])
Great rhombicosidodecahedron (Robert Williams,^[2] Peter Cromwell^[3])
Omnitruncated dodecahedron or icosahedron (Norman Johnson^[4]
)

Icosidodecahedron and its truncation

The name great rhombicosidodecahedron refers to the relationship with the (small) rhombicosidodecahedron (compare section Dissection).
There is a

nonconvex uniform polyhedron with a similar name, the nonconvex great rhombicosidodecahedron

.

Area and volume

The surface area A and the volume V of the truncated icosidodecahedron of edge length a are:^[citation needed]

{\begin{aligned}A&=30\left(1+{\sqrt {3}}+{\sqrt {5+2{\sqrt {5}}}}\right)a^{2}&&\approx 174.292\,0303a^{2}.\\V&=\left(95+50{\sqrt {5}}\right)a^{3}&&\approx 206.803\,399a^{3}.\end{aligned}}

If a set of all 13 Archimedean solids were constructed with all edge lengths equal, the truncated icosidodecahedron would be the largest.

Cartesian coordinates

even permutations of:^[5]

(±1φ, ±1φ, ±(3 + φ)),

(±2φ, ±φ, ±(1 + 2φ)),

(±1φ, ±φ², ±(−1 + 3φ)),

(±(2φ − 1), ±2, ±(2 + φ)) and

(±φ, ±3, ±2φ),

where φ = 1 + √5/2 is the golden ratio.

Dissection

The truncated icosidodecahedron is the convex hull of a rhombicosidodecahedron with cuboids above its 30 squares, whose height to base ratio is $φ$ . The rest of its space can be dissected into nonuniform cupolas, namely 12 between inner pentagons and outer decagons and 20 between inner triangles and outer hexagons.

An alternative dissection also has a rhombicosidodecahedral core. It has 12 pentagonal rotundae between inner pentagons and outer decagons. The remaining part is a toroidal polyhedron.

dissection images
These images show the rhombicosidodecahedron (violet) and the truncated icosidodecahedron (green). If their edge lengths are 1, the distance between corresponding squares is $φ$ . The toroidal polyhedron remaining after the core and twelve rotundae are cut out

Orthogonal projections

The truncated icosidodecahedron has seven special

Coxeter planes

.

Orthogonal projections
Centered by	Vertex	Edge 4-6	Edge 4-10	Edge 6-10	Face square	Face hexagon	Face decagon
Solid
Wireframe
Projective symmetry	[2]⁺	[2]	[2]	[2]	[2]	[6]	[10]
Dual image

Spherical tilings and Schlegel diagrams

The truncated icosidodecahedron can also be represented as a

spherical tiling, and projected onto the plane via a stereographic projection. This projection is conformal

, preserving angles but not areas or lengths. Straight lines on the sphere are projected as circular arcs on the plane.

perspective projection

and straight edges.

Orthographic projection	Stereographic projections
	Decagon-centered	Hexagon-centered	Square-centered

Geometric variations

Within Icosahedral symmetry there are unlimited geometric variations of the truncated icosidodecahedron with isogonal faces. The truncated dodecahedron, rhombicosidodecahedron, and truncated icosahedron as degenerate limiting cases.

Truncated icosidodecahedral graph

In the

graph of vertices and edges of the truncated icosidodecahedron, one of the Archimedean solids. It has 120 vertices and 180 edges, and is a zero-symmetric and cubic Archimedean graph.^[6]

Schlegel diagram graphs
3-fold symmetry	2-fold symmetry

Related polyhedra and tilings


Bowtie icosahedron and dodecahedron contain two trapezoidal faces in place of the square.^[7]

Family of uniform icosahedral polyhedra
Symmetry: [5,3], (*532)							[5,3]⁺, (532)


{5,3}	t{5,3}	r{5,3}	t{3,5}	{3,5}	rr{5,3}	tr{5,3}	sr{5,3}
Duals to uniform polyhedra

V5.5.5	V3.10.10	V3.5.3.5	V5.6.6	V3.3.3.3.3	V3.4.5.4	V4.6.10	V3.3.3.3.5

This polyhedron can be considered a member of a sequence of uniform patterns with vertex figure (4.6.2p) and

omnitruncated polyhedra (zonohedrons), shown below as spherical tilings. For p > 6, they are tilings of the hyperbolic plane, starting with the truncated triheptagonal tiling

.

n32 symmetry mutation of omnitruncated tilings: 4.6.2n* v t e
Sym. *n32 [n,3]	Spherical				Euclid.	Compact hyperb.		Paraco.	Noncompact hyperbolic
Sym. *n32 [n,3]	*232 [2,3]	*332 [3,3]	*432 [4,3]	*532 [5,3]	*632 [6,3]	*732 [7,3]	*832 [8,3]	*∞32 [∞,3]	[12i,3]	[9i,3]	[6i,3]	[3i,3]
Figures
Config.	4.6.4	4.6.6	4.6.8	4.6.10	4.6.12	4.6.14	4.6.16	4.6.∞	4.6.24i	4.6.18i	4.6.12i	4.6.6i
Duals
Config.	V4.6.4	V4.6.6	V4.6.8	V4.6.10	V4.6.12	V4.6.14	V4.6.16	V4.6.∞	V4.6.24i	V4.6.18i	V4.6.12i	V4.6.6i

Notes

^ ^a ^b Wenninger Model Number 16
^ ^a ^b Williams (Section 3-9, p. 94)
^ ^a ^b Cromwell (p. 82)
^ ^a ^b Norman Woodason Johnson, "The Theory of Uniform Polytopes and Honeycombs", 1966
^ Weisstein, Eric W. "Icosahedral group". MathWorld.
^ Read, R. C.; Wilson, R. J. (1998), An Atlas of Graphs, Oxford University Press, p. 269
^ Symmetrohedra: Polyhedra from Symmetric Placement of Regular Polygons Craig S. Kaplan