The Orthocentroidal Circle
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The altitudes of a triangle intersect in a point H, called the orthocenter. The medians of a triangle intersect in a point G, called the centroid. The circle with diameter HG is called the orthocentroidal circle.
Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
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"The Orthocentroidal Circle"
http://demonstrations.wolfram.com/TheOrthocentroidalCircle/
Wolfram Demonstrations Project
Published: March 7 2011