Concurrent Lines that Intersect on the Euler Line
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The Euler line of a triangle goes through the circumcenter 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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Details
See problem 5 for day 2 in the Iranian 2005 National Math Olympiad (3rd round).
Permanent Citation
"Concurrent Lines that Intersect on the Euler Line"
http://demonstrations.wolfram.com/ConcurrentLinesThatIntersectOnTheEulerLine/
Wolfram Demonstrations Project
Published: March 7 2011