The regular convex polyhedra are the five Platonic solids ... of Geometry that there are only five Platonic solids – the regular tetrahedron (four sides that are equilateral triangles), the cube (six ...
A 3D shape with all straight edges and flat faces is a polyhedron. Other 3D shapes with ... The number of rectangular faces is equal to the number of sides of the polygon cross-section.
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