Check out this lesson plan and activity for building Icosahedron. Includes links to related resources.

Have fun learning geometry by searching for hidden polygons or measuring the Golden Ratio. Includes a glossary.

Guide for the student introduces the key principles, postulates and equations which populate the world of geometry.

Presents pointers on geometric properties of polygons, polyhedra, and higher dimensional polytopes.

Connect to links describing the history of geometry. Includes articles, forums, and a bibliography.

Learn about points, lines, planes, space, postulates, and theorems. Get an understanding of proofs with sample problems.