The Small Rhombicosidodecahedron

A semi-regular polyhedron with (in order) a triangle, a square, a pentagon, and another square surrounding each vertex.

The small rhombicosidodecahedron is one of the thirteen archimedian solids. Each of its faces belongs to one of three circubscribing solids: the dodecahedron, the icosahedron, and the rhombic triacontahedron.

Vertex
Symbol
Wythoff
Symbol
No. of
Vertices
No. of
Edges
{3}
Faces
{4}
Faces
{5}
Faces
Symmetry
Group
Dual Polyhedron
3.4.5.4 3 5 | 2 60 120 20 30 12 A5×C2 Trapezoidal
Hexecontahedron
Edge
Inter-Radius
= root2 tan18°   Edge
Circum-Radius
= 2root(11 – 4root5)
root41
Edge
Icosahedral Edge
= 1 + 3root5
22
  Edge
Dodecahedral Edge
= 1 + root5
6
  Edge
Long Rhombic Diagonal
= 3 – root5
2