National Museum of American History Polyhedron Model by Martin Berman, Square Pyramid National Museum of American History Polyhedron Model by Martin Berman, Pentagonal Pyramid National Museum of ...
Three square faces meet at a vertex ... Platonic solids close platonic solidA polyhedron with regular polygon faces. These are the tetrahedron, cube, octahedron, dodecahedron and icosahedron.
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