Feuerbach's Theorem
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The nine-point circle of a triangle passes through the feet of the altitudes, the midpoints of the sides, and the midpoints between the vertices and the orthocenter.
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Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
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"Feuerbach's Theorem"
http://demonstrations.wolfram.com/FeuerbachsTheorem/
Wolfram Demonstrations Project
Published: March 7 2011