The Orthocenter of the Medial Triangle
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The circumcenter O of a triangle is the orthocenter of its medial triangle.
Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
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See Problem 1 in N. Altshiller-Court, College Geometry, 2nd ed., Mineola, NY: Dover, 2007 p. 96.
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"The Orthocenter of the Medial Triangle"
http://demonstrations.wolfram.com/TheOrthocenterOfTheMedialTriangle/
Wolfram Demonstrations Project
Published: March 7 2011