Edit made on August 13, 2011 by ColinWright at 17:17:04
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WW WM
HEADERS_END
[[[>50 IMG:Orthocentre.png ]]]
The point in a triangle where the altitudes meet.
Related - the nine-point circle is a circle that goes
through the mid-points of each side, the foot of each
altitude, and the midpoint of each line from a vertex
to the orthocentre,