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 Everyday Examples
 Tetrahedron:  A regular polyhedron whose four faces are congruent equilateral triangles.
A tetrahedron is a solid with four congruent, equilateral, triangular faces. In this picture, five red tetrahedrons connect to form each yellow star pattern. This fancy tetrahedron compound was constructed by the technique of origami.

Tetrahedron Compound

Tetrahedron compound constructed and photo courtesy of Jim Plank. Visit Jim's site to see more shapes created with origami.