A polygon is regular if it is uniform and its faces are all alike. The regular convex polyhedra are the five Platonic solids, which have been known since classical Greece. The ancient Greek ...

Therefore we can only make five Platonic solids. Image caption, These solids were named after the ancient Greek mathematician Plato. He believed the universe was made of five elements – fire ...

A 3D shape with regular polygonal faces, meeting at equal angles, is a platonic solid. There are five platonic solids, the tetrahedron, cube, octahedron, dodecahedron and icosahedron. A prism is a ...

I decided instead to make up a list of TV’s best platonic relationships ... And Peggy telling Don she was leaving SCDP in season five was one of the most emotional moments in the show’s history.