It isInscriptible in tetrahedron. A paper tag on the model reads: O 13. Another paper tag reads: R.N.S. Merritt (/) Mar 31, 1938. A mark in pencil above this tag reads: 151. Location Currently not on ...

Written beneath each shape is their name; tetrahedron, cube, octahedron, dodecahedron and icosahedron., A 3D shape with regular polygonal faces, meeting at equal angles, is a platonic solid.

Even though mathematicians have spent over 2,000 years dissecting the structure of the five Platonic solids — the tetrahedron, cube, octahedron, icosahedron and dodecahedron — there's still a lot we ...