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Visit this site: http://www.cut-the-knot.org/

Author:Alexander Bogomolny
Description: "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 award-winning 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 CD-ROM.

Levels: Middle School (6-8), High School (9-12), College
Languages: English
Resource Types: Graphics, Problems/Puzzles, Web-Based Discussions, Link Listings, Books, Humor, Dictionaries, Glossaries, Thesauri, Web Interactive/Java
Math Topics: Basic Algebra, Linear Algebra, Arithmetic/Early Math, Discrete Math, Fractals, Higher-Dimensional Geometry, Polyhedra, Euclidean Plane Geometry, Conic Sections and Circles, Constructions, Coordinate Plane Geometry, Triangles and Other Polygons, Non-Euclidean Geometry, Logic/Foundations, Probability, Statistics, Topology
Math Ed Topics: Problem-Solving

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