Interactive Mathematics Miscellany and Puzzles
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http://www.cuttheknot.org/  


Alexander Bogomolny  
"The peculiar beauty of Mathematics lies in deduction, in the dependency of one fact upon another. The less expected a dependency is, the simpler the facts on which the deduction is based  the more beautiful is the result." This awardwinning site offers games and puzzles, quotes, and much more on a variety of topics from arithmetic and algebra to geometry and probability, and includes solutions and the mathematical theory behind each puzzle. There are also the CTK Exchange (a small discussion group for questions and answers about math problems); the Eye Opener Series (Java applets that illustrate and help solve or prove math problems); a math bookstore; a glossary; a monthly interactive column using Java applets for MAA Online; and the CTK Insights blog. The whole site is available on CDROM.  


Levels:  Middle School (68), High School (912), College 
Languages:  English 
Resource Types:  Graphics, Problems/Puzzles, WebBased Discussions, Link Listings, Books, Humor, Dictionaries, Glossaries, Thesauri, Web Interactive/Java 
Math Topics:  Basic Algebra, Linear Algebra, Arithmetic/Early Math, Discrete Math, Fractals, HigherDimensional Geometry, Polyhedra, Euclidean Plane Geometry, Conic Sections and Circles, Constructions, Coordinate Plane Geometry, Triangles and Other Polygons, NonEuclidean Geometry, Logic/Foundations, Probability, Statistics, Topology 
Math Ed Topics:  ProblemSolving 
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