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

Author:Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Description: A collection of Java applets that illustrate and thus help to solve or prove various math problems: Euclid's Proof of the Pythagorean Theorem; Construction problem; Disappearing Lines puzzle; Sam Loyd's fifteen; Sliders puzzle; Lucky 7 puzzle; Happy 8 puzzle; Blithe 12 puzzle; Binary Color Device; Analog gadgets; Wythoff's Nim; Changing Colors; Breaking Chocolate Bars; Calendar Magic; Squares and Circles; Diagonal Count; Flipping pancakes; Four Knights; Latin Squares; Marriage Problem; Solitaire on the Circle; Proofs Without Words; Make Your Move, Kid!

Levels: Elementary, Middle School (6-8), High School (9-12), College
Languages: English
Resource Types: Problems/Puzzles, Web Interactive/Java
Math Topics: Calendars/Dates/Time, Number Sense/About Numbers, Triangles and Other Polygons

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