The Nagel point is the point of concurrence of the three lines connecting the triangle vertices and the point where the excircle
meets the opposite side.

Christian Heinrich von Nagel (1803-1882) geometer and educator.

See also:
Semiperimeter and Incircle
Semiperimeter and Excircles
Semiperimeter, Incircle and Excircles
Ceva's Theorem
Menelaus' theorem
Gergonne Point
Nagel Point flowchart proof
Puzzle of the Nagel Point
Triangle with the bisectors of the exterior angles. Collinearity

 

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Last updated: April 19, 2007