Most recent change of Orthocentre

Edit made on August 13, 2011 by ColinWright at 17:17:04

Deleted text in red / Inserted text in green

[[[>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,