If 
is a point on the circumcircle
of a reference triangle, then the line 
, where 
is the isogonal conjugate
of 
, is called the antipedal line of 
. It is a central
line if 
is a center (Kimberling 1998, p. 150).
Antipedal Line
See also
Antipedal Triangle, Central Line, Isogonal Conjugate, Pedal LineExplore with Wolfram|Alpha
References
Kimberling, C. "Triangle Centers and Central Triangles." Congr. Numer. 129, 1-295, 1998.Referenced on Wolfram|Alpha
Antipedal LineCite this as:
Weisstein, Eric W. "Antipedal Line." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/AntipedalLine.html