Related Polyhedra and Polytopes
The icosahedron can be transformed by a truncation sequence into its dual, the dodecahedron:
| {5,3} | t0,1{5,3} | t1{5,3} | t0,1{3,5} | {3,5} | t0,2{5,3} | t0,1,2{5,3} | s{5,3} |
|---|---|---|---|---|---|---|---|
As a snub tetrahedron, and alternation of a truncated octahedron it also exists in the tetrahedral and octahedral symmetry families:
| {3,3} | t0,1{3,3} | t1{3,3} | t1,2{3,3} | t2{3,3} | t0,2{3,3} | t0,1,2{3,3} | s{3,3} |
|---|---|---|---|---|---|---|---|
| {4,3} | t0,1{4,3} | t1{4,3} | t0,1{3,4} | {3,4} | t0,2{4,3} | t0,1,2{4,3} | s{4,3} | h0{4,3} | h1,2{4,3} |
|---|---|---|---|---|---|---|---|---|---|
This polyhedron is topologically related as a part of sequence of regular polyhedra with Schläfli symbols {3,n}, continuing into the hyperbolic plane.
{3,3} |
{3,4} |
{3,5} |
{3,6} |
{3,7} |
{3,8} |
{3,9} |
The regular icosahedron, seen as a snub tetrahedron, is a member of a sequence of snubbed polyhedra and tilings with vertex figure (3.3.3.3.n) and Coxeter–Dynkin diagram . These figures and their duals have (n32) rotational symmetry, being in the Euclidean plane for n=6, and hyperbolic plane for any higher n. The series can be considered to begin with n=2, with one set of faces degenerated into digons.
| Symmetry | 232 + D3 |
332 + T |
432 + O |
532 + I |
632 + P6 |
732 + |
832 + |
|---|---|---|---|---|---|---|---|
| Order | 6 | 12 | 24 | 60 | ∞ | ||
| Snub figure |
3.3.3.3.2 |
3.3.3.3.3 |
3.3.3.3.4 |
3.3.3.3.5 |
3.3.3.3.6 |
3.3.3.3.7 |
3.3.3.3.8 |
| Coxeter Schläfli |
s{2,3} |
s{3,3} |
s{4,3} |
s{5,3} |
s{6,3} |
s{7,3} |
s{8,3} |
| Snub dual figure |
V3.3.3.3.2 |
V3.3.3.3.3 |
V3.3.3.3.4 |
V3.3.3.3.5 |
V3.3.3.3.6 |
V3.3.3.3.7 |
|
| Coxeter | |||||||
The icosahedron shares its vertex arrangement with three Kepler–Poinsot solids. The great dodecahedron also has the same edge arrangement.
| Picture | Great dodecahedron |
Small stellated dodecahedron |
Great icosahedron |
|---|---|---|---|
| Coxeter-Dynkin |
The icosahedron can tessellate hyperbolic space in the order-3 icosahedral honeycomb, with 3 icosahedra around each edge, 12 icosahedra around each vertex, with Schläfli symbol {3,5,3}. It is one of four regular tessellations in the hyperbolic 3-space.
It is shown here as an edge framework in a Poincaré disk model, with one icosahedron visible in the center. |
Read more about this topic: Icosahedron
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