Ajay's Math World [ Teens/Mature Teens ] - Geometry and math formulas, software, and games. http://www.ajaysworld.net

Areas, Volumes, Surface Areas [ Teens ] - Use these simple illustrated formulas to calculate volume and surface area of various shapes. http://math2.org/math/geometry/areasvols.htm

Cynthia Lanius' Lessons: Geometry Online [ Teens/Mature Teens ] - Have fun learning through activities about polygons, triangles, circles, and the volume of cylinders. Page includes an historic timeline, SAT type quiz, and glossary of terms. http://math.rice.edu/~lanius/Geom/

Figures and Polygons [ Kids/Teens/Mature Teens ] - Shows different types of straight-sided shapes with up to ten sides. Gives the total number of degrees for each side. http://www.mathleague.com/help/geometry/polygons.htm

Fugues of the Well-Tempered Clavier [ Kids/Teens/Mature Teens ] - Interactive Director movie comparing a fugue by Johann Sebastian Bach to a M?bius strip. http://jan.ucc.nau.edu/~tas3/wtc/i10.html

Geometria [ Teens/Mature Teens ] - A program for computing lines, surfaces and volumes of the main plane and solid figures, through direct and indirect formulas. Includes multiple languages. http://www.ElvenKids.com/tools/geometria/Geometria.php

Geometry [ Kids/Teens ] - Explains and describes geometric terms, measurement of angles, types of figures, coordinate graphs, areas and volumes. http://www.mathleague.com/help/geometry/geometry.htm

Geometry [ Teens ] - Games, illustrations, and definitions. http://www.coolmath4kids.com/geometrystuff.html

Geometry from the Land of the Incas [ Teens/Mature Teens ] - Presents problems involving circles and triangles, with proofs, SAT practice quizzes and famous quotes. Also, has examples of geometry in Peruvian culture. http://agutie.homestead.com/

Geometry Online [ Teens ] - Contains java programs an executables related to geometry. Also provides jokes and proof templates. http://whiz.at/geometry

Introduction to the Works of Euclid [ Teens/Mature Teens ] - Covers the life of Euclid and a discussion of Euclidean geometry. http://www.obkb.com/dcljr/euclid.html

Point Out the View [ Kids/Teens ] - Use visualization to determine how four different people see a set of 3-D blocks. From PBS Kids. http://pbskids.org/cyberchase/games/pointofview/pointofview.html

Spaceship Builder [ Kids ] - Use a virtual geoboard to help Dr. Marbles design a new fleet of cyberspace ships. From PBS Kids. http://pbskids.org/cyberchase/games/perimeterarea/perimeterarea.html

Tangrams [ Kids/Teens ] - Choose a puzzle, then click and drag virtual tangram pieces to solve it. From PBS. http://pbskids.org/sagwa/games/tangrams/index.html

Teen Math Whizzes Go Euclid One Better [ Mature Teens ] - Features a discussion about the works of two teenagers, David Goldenheim and Daniel Litchfieldm, from Connecticut. They helped find a solution that eluded Euclid in finding a method to partition a line into any number of equal sections. http://jwilson.coe.uga.edu/Texts.Folder/GLaD/GLaD.Comments.html

The Everlasting Pi [ Teens/Mature Teens ] - The history, uses,and creator of pi and also some fun facts, jokes and songs. http://www.freewebs.com/abishek

The Pythagorean Theorem Lesson [ Teens ] - A lesson on the pythagorean theorem with the objective that the you will discover for yourself the actual theorem. http://www.arcytech.org/java/pythagoras/index.html

Tim's Triangular Page [ Teens/Mature Teens ] - Learn about the basic properties, formulas, theorems and different types of triangles. Includes proofs and illustrations. http://sakharov.net/triangle.html