U-Draw Fractals -Fractal art, computer-generated art, fractal music.

Categorical Geometry -Find algebra, geometry, logic, set theory, and info on Pythagoras, Euclid, Archimedes, Descartes, Boole, Goedel, Turing, and Grothendieck.

Geometry of the Sphere -The material on these pages was part of the Advanced Mathematics course in the High School Teachers Program and includes planes, circles, spheres, lunes, lines, angles, Girard's theorem, and spherical polygons.

The Geometry Junkyard -Find topics on circles and spheres, dissection, fractals, geometric topology, hyperbolic geometry, origami, geometric probability, lesson plans, planar geometry, spirals.

Four Color Theorem -This page gives a brief summary of a new proof of the Four Color Theorem and a four-coloring algorithm.

Geometry in Action -See how geometry is used in real life.

Math Games -Find info for teachers, math, trivia and word contests, and weekly prizes.

Puzzles with polyhedra and numbers -In this site one can print copies of polyhedron puzzles (for non-commercial purposes only).

Native American Geometry -This site uses art and architecture of Native Americans to teach geometry and math to Grades 4-12. Find Indian archaeology, circle, science, compass, protractor, angles, directions, hexagon, triangle, square, pentagon, decagon, octagon, polygon construction.

Mathlab.com -Find geometry, Euclid's Elements, straightedge, compass, hands-on geometry, the Elements, virtual tools, lines, and circles.