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The Altitudes and the Euler Line

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Visit this site: http://www.cut-the-knot.org/triangle/altEuler.html
Author:Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Description: 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 9-Point 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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