The tetrahedron, cube, octahedron, dodecahedron, and icosahedron are collectively known as what kind of solids?
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Platonic solids
A Platonic solid is a regular, convex polyhedron. It is constructed by congruent, regular, polygonal faces with the same number of faces meeting at each vertex.
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- What collective name is given to the five regular, convex polyhedra: the tetrahedron, cube, octahedron, dodecahedron, and icosahedron?