Polygons ( means many sides). They are called solids or polyhedrons; they exist in three dimensions and not two.
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No; platonic solids are tetrahedron, cube, octahedron, dodecahedron, icosahedron.
There are 5 platonic solids. They are: Tetrahedron, Octahedron, Icosahedron, Cube, and Dodecahedron
Tetrahedron (4 faces), Cube (6), Octahedron (8), Dodecahedron (12) and Icosahedron (20).
Tetrahedron (4 faces), Cube (6), Octahedron (8), Dodecahedron (12) and Icosahedron (20).
A tetrahedron is its own dual. An octahedron is the dual of a cube and conversely. An icosahedron is the dual of a dodecahedron and conversely.