Nagel point [SEP] named after
", "CT" concur in the Nagel point "N" of triangle "ABC". The Nagel point is named after Christian Heinrich von Nagel, a nineteenth-century German mathematician, who wrote about it in 1836.
Another construction of the point "T" is to start at "A" and trace around triangle "ABC" half its perimeter, and similarly for "T" and "T". Because of this construction, the Nagel point is sometimes also called the bisected perimeter point, and
centroid, the circumcenter, the orthocenter and the nine-point center of triangle "ABC". The trilinear equation of the Euler line is 
This is the central line associated with the triangle center "X".
Some more named central lines Nagel line.
"Nagel line" of triangle "ABC" is the line passing through the centroid, the incenter, the Spieker center and the Nagel point of triangle "ABC". The trilinear equation of the Nagel line is
This is the central line associated with