Incenter, Circumcenter, Centroid, Orthocenter: Journey to the Center of a Triangle (1976)

Video Description: Journey to the Center of a Triangle (1977), International Film Bureau Inc., Bruce Cornwell. This movie is part of the collection: Academic Film Archive of North America

Incenter: is the point of concurrence of the triangle's angle bisectors and the center of the incircle.

Circumcenter: is the point of concurrence of the triangle's three perpendicular bisectors and the center of the circumcircle.

Centroid: is the point of concurrence of the triangle's three triangle medians.

Orthocenter: is the point of concurrence of the triangle's three altitudes.