Pi Day - http://mathforum.org/t2t/faq/faq.pi.html Activities for a Pi Day, March 14 (3.14) celebration including pi math problems, history, songs, stories, and greetings.
Polyhedra: Learning by Building - http://www.math.umn.edu/~morgan/Triangles.html Teaching project that let's students learn about polyhedra by using kite materials to create life size forms. Exercises include measuring surface area, volumes, and changing the form to simpler shapes.
E-Z Geometry - http://www.e-zgeometry.com/ For high school teachers and students. Products include an interactive textbook, class video clips, projects, glossary, and resource links.
Help build the largest human-edited
directory on the web.