a convex polyhedron that can be constructed from pentagonal antiprism by attaching two pentagonal pyramids with regular faces to each of its pentagonal faces.

### Regular icosahedron

In geometry, the regular icosahedron is a convex polyhedron that can be constructed from pentagonal antiprism by attaching two pentagonal pyramids with regular faces to each of its pentagonal faces, or by putting points onto the cube. Wikipedia

Dihedral angle (degrees): 138.190 (approximately)

Dual polyhedron: Regular dodecahedron

Edges: 30

Faces: 20

Properties: convex, composite

Symmetry group: Icosahedral symmetry

Vertices: 12

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### Regular Icosahedron - Superprof

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A regular icosahedron belongs to the family of the regular polyhedron which means every triangle is an equilateral triangle.