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# There are five regular polyhedra: a tetrahedron, an octahedron, a cube (also known as a hexahedron), a dodecahedron, and an icosahedron:

tetrahedron
octahedron
cube
dodecahedron
icosahedron

Why are these five geometric solids called regular polyhedrons?

The sides of regular polyhedra are regular polygons, and regular polygons are those for which, in turn, all sides are equal (e.g., triangle, square).

The reason the word is correct is that all regular polyhedra are made up of regular polygons. But here, we must take into account a small but significant detail. Regular polyhedra can consist only of homogeneous polygons (i.e., cubes can only come from squares, and so on). In terms of mathematics, regular polyhedra consist of homogeneous polygons.

Find out about the properties of these geometric solids here.

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