Classifying 3D shapes

Polyhedra, Platonic solids, prisms and pyramids For more about Euler’s formula and why there are only 5 Platonic solids see Credits: Many 3D shape graphics used in this video are from - Copyright © 2012 Rod Pierce, . Used with permission. Animations of the Platonic solids are from Wikipedia Animations of cross-sections were created using Trimble SketchUp ht