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The Altitudes

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Visit this site: http://www.cut-the-knot.org/triangle/altitudes.html
Author:Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Description: A collection of proofs of the concurrency of altitudes in triangles, featuring a Java applet with which one can see the various points, lines, triangles, and circles associated with any given triangle.
Levels: High School (9-12), College
Languages: English
Resource Types: Web Interactive/Java
Math Topics: Triangles and Other Polygons

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