History
Even though the ancient Greeks discovered the classic centers of a triangle they had not formulated any definition of a triangle center. After the ancient Greeks, several special points associated with a triangle like Fermat point, nine-point center, symmedian point, Gergonne point, and Feuerbach point were discovered. During the revival of interest in triangle geometry in the 1980s it was noticed that these special points share some general properties that now form the basis for a formal definition of triangle center. As of 15 October 2012 (2012-10-15), Clark Kimberling's Encyclopedia of Triangle Centers contains an annotated list of 5,389 triangle centers.
Read more about this topic: Triangle Center
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