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|Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny|
|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|
|Resource Types:||Web Interactive/Java|
|Math Topics:||Triangles and Other Polygons|
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