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 Dodecahedron:  A regular polyhedron whose twelve faces are congruent regular pentagons.

George Hart's Platonic Solids Page: See more examples of the Platonic Solids.

Solids at ScienceU.com: Read about special types of solids - the Platonics Solids and the Archimedian Solids.

Classroom Polyhedra Activities at GeorgeHart.com: Ideas to help incorporate the study of polyhedra into the classroom.

George Hart's Platonic Relationship Page: Read about examples of the Platonic Relationships.

Virtual Manipulatives - Algebra Balance Scales: Applet to help solve one-step algebra equations.