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.