Regular solids (regular polyhedra, or Platonic solids which were
described by Plato) are solid geometric figures, with identical
polygons (such as squares) as their faces, and with the same number of
faces meeting at every corner (vertex). Euclid proved that
there are only five regular convex polyhedra.
The five Platonic Solids were thought to represent the
five basic elements of the world; earth, air, fire, water, and the
The "regular solids" are important in many
aspects of chemistry, crystallography, and mineralogy.
|Animated solids used with permission of
creator Rüdiger Appel (all rights reserved).