The Altitudes and the Euler Line
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Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny  
A proof of the existence of the orthocenter of a triangle embodying several concepts such as Morley's complex interpolation theory, Napoleon's theorem, and Morley's miracle; with examples of the theorems and a geometric explanation of the Euler Line and the 9Point Circle. Includes a reference list and a Java applet for interactive investigations of the proof.  


Levels:  College 
Languages:  English 
Resource Types:  Web Interactive/Java 
Math Topics:  Euclidean Plane Geometry 
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