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The Butterfly Theorem

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

Author:Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Description: Ten proofs (and a few variations) of the beautiful Butterfly theorem, with illustrations and remarks. Links to some generalizations: A Better Butterfly theorem, 2N-Winged Butterfly theorem, several pages on the Two Butterflies theorem. Several of these have interactive Java illustrations.

Levels: High School (9-12), College
Languages: English
Resource Types: Graphics, Publications, Web Interactive/Java
Math Topics: Euclidean Plane Geometry

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