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of the Platonic solids--whose faces are 20 equilateral triangles.

Regular icosahedra

There are two objects, one convex and one nonconvex, that can both be referred to as regular icosahedra, characterized by 30 edges and 20 triangular faces. The term "regular icosahedron" generally refers to a convex polyhedron, both a deltahedron and a Platonic solid;

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