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The center of an Excircle. There are three excenters for a given Triangle, denoted
,
,
. The Incenter
and excenters
of a Triangle are an Orthocentric System.
See also Centroid (Orthocentric System), Excenter-Excenter Circle, Excentral Triangle, Excircle, Incenter, Mittenpunkt
References
Dixon, R. Mathographics. New York: Dover, pp. 58-59, 1991.
Johnson, R. A. Modern Geometry: An Elementary Treatise on the Geometry of the Triangle and the Circle. Boston, MA:
Houghton Mifflin, 1929.