A sphere centered at the centroid can be sized to encompass all the triangle's vertices. This is done by subtracting from the point coordinates the coordinates of the respective centroid. The triangular cross sectional area varies linearly with the vertical height of its centroid. They intersect at the "vertex centroid" of the quadrilateral (see Remarkable points below). This is known as nearest centroid classifier or Rocchio algorithm. The "vertex centroid" is the intersection of the two bimedians. It has the property of being the reflection of the circumcenter in the "vertex centroid". In any given triangle, the circumcenter is always collinear with the centroid and orthocenter. The second is an orthogonal line passing through the centroid of the chosen face. A conjugate diameter bisects the chords, being placed between the centroid and the tangent point. The geometric centroid of a convex object always lies in the object. These seven line segments all meet at the "centroid" of the tetrahedron. Therefore the neutral axis lies on the centroid of the cross section. There are four medians, and they are all concurrent at the "centroid" of the tetrahedron. Homing in the terminal phase is done by area correlation around the centroid.