Recall each of the four centers of triangles that we have defined:
Circumcenter- The point of concurrency of the perpendicular bisectors of a triangle
Incenter- The point of concurrency of the angle bisectors of a triangle.
Centroid- The point of concurrency of the medians of a triangle
Orthocenter- The point of concurrency of the altitudes of a triangle.
Finding the coordinates of a centroid given the coordinates of the triangles vertices
Finding the coordinates of an orthocenter given the coordinates of the three vertices in a triangle
MISTAKE: x=5 is a VERTICAL line not a horizontal one.
