Mathematics

Geometry from the Land of the Incas
http://agutie.homestead.com/files/index.html

Polygon Properties
http://www.math.com/tables/geometry/polygons.htm

Geometry Tutorials, Problems
http://www.analyzemath.com/geometry.html

Math for Morons Like Us
http://library.thinkquest.org/20991/home.html

An Intriguing Geometry Problem
http://mathcircle.berkeley.edu/BMC4/Handouts/geoprob.pdf

Take a free Maths Test every fortnight at
http://free-quiz.4gmat.com/

Divisibility Rules
http://mathforum.org/k12/mathtips/division.tips.html

Proof of Pythagorus Theorem
http://mathforum.org/isaac/problems/pythagthm.html

Beat the Calculator
http://mathforum.org/k12/mathtips/beatcalc.html

See again
http://mathforum.org/k12/mathtips/mathtips.html
http://mathforum.org/isaac/problems/prime1.html