Bisectors of the Angles of the Orthic Triangle
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The altitudes of an acute triangle bisect the internal angles of the orthic triangle.
Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
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See theorem 192 in N. Altshiller-Court, College Geometry, Mineola, NY: Dover, 2007 p. 98.
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"Bisectors of the Angles of the Orthic Triangle"
http://demonstrations.wolfram.com/BisectorsOfTheAnglesOfTheOrthicTriangle/
Wolfram Demonstrations Project
Published: March 7 2011