In geometry, the Fuhrmann circle of a triangle is the circle with a diameter of the line segment between the orthocenter H and the Nagel point N. which is also the distance between the circumcenter and incenter. ... Found on http://en.wikipedia.org/wiki/Fuhrmann_circle
1) Triangle geometry 
In geometry, the Fuhrmann circle of a triangle is the circle with a diameter of the line segment between the orthocenter H and the Nagel point N. which is also the distance between the circumcenter and incenter. ...