You’ve seen these shapes before even if you didn’t know they were called Platonic Solids. This video explains what they are and why there are only five of them.

Polyhedrons are 3 dimensional shapes with many sides or faces. Polygons are 2 dimensional (flat) shapes with many sides.

A Platonic Solid is a regular polyhedron whose faces are identical in shape and size, whose angles and edges are all equal, and have the same number of faces at each vertex. To “fold” polygons into Platonic Solid polyhedrons, the polygons themselves must have angles that combine to less than 360 degrees.

The video visualizes this with drawings and physical shapes.