The Euler Line and the 9point Circle
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Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny  
A geometric explanation of the Euler Line  how complex numbers give us a broader outlook on the geometric configuration  and the 9point circle of a triangle ABC, which passes through the feet of the three altitudes, the midside points of ABC, and the midpoints of segments that join the orthocenter with the vertices of the triangle.  


Levels:  High School (912), College 
Languages:  English 
Resource Types:  Web Interactive/Java 
Math Topics:  Conic Sections and Circles, Triangles and Other Polygons 
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