The Icosahedron
A polyhedron bounded by twenty equilateral triangles; five meeting at each vertex.
The icosahdedron is one of the five platonic solids.
| Vertex Symbol |
Wythoff Symbol |
No. of Vertices |
No. of Edges |
No. of Faces |
Symmetry Group |
Dual Polyhedron |
| 35 | 5 | 2 3 | 12 | 30 | 20 | A5×C2 | Dodecahedron |
|
Edge In-Radius |
= |
 3 (3 – 5)
|
Edge Inter-Radius |
= |
5 – 1
|
Edge Circum-Radius |
= |
(10 – 25)5
|