National Museum of American History Polyhedron Model by Martin Berman, Regular Tetrahedron National Museum of American History Polyhedron Model by Martin Berman, Regular Octahedron National Museum of ...
A 3D shape with all straight edges and flat faces is a polyhedron. Other 3D shapes with least one curved surface are not polyhedra. A 3D shape with regular polygonal faces, meeting at equal angles ...
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