<Li> A triangle's altitudes run from each vertex and meet the opposite side at a right angle . The point where the three altitudes meet is the orthocenter . </Li> <Li> Angle bisectors are rays running from each vertex of the triangle and bisecting the associated angle . They all meet at the incenter . </Li> <Li> Medians connect each vertex of a triangle to the midpoint of the opposite side . The three medians meet at the centroid . </Li> <Li> Perpendicular bisectors are lines running out of the midpoints of each side of a triangle at 90 degree angles . The three perpendicular bisectors meet at the circumcenter . </Li>

The point of concurrence of medians is called