Description
Orthocenter -- intersection of ALTITUDES
Circumcenter -- intersection of PERPENDICULAR BISECTORS
Centroid -- intersection of MEDIANS
Incenter -- intersection of ANGLE BISECTORS
Excenter – intersection of three angle bisectors: the bisectors of two exterior angles and the bisector of the opposite interior angle. Depending on which angles you choose, you can find three different excenters for each triangle.
see file for more....