In a triangle, a cevian is a line segment whit one endpoint at a vertex of the triangle and the other endpoint on the opposite side. Sometimes cevians come in sets of three, like the three medians of a triangle, the three angle bisectors, or the three altitudes. In each of these cases, the three cevians are concurrent: The medians meet at the centroid, the angle bisectors meet at incenter, and the altitudes meet at orthocenter.