1.A ray, , is the set of points beginning at point A and going infinitely in the direction of point B.. Line Segment 2.The point on a segment that divides the segment into two equal segments. Opposite rays 3.Ray BA and ray BC are opposite rays if A, B, and C are collinear and B (the endpoint of both rays) is between A and C. Space 4.A set of two or more points all on the same plane. Midpoint of a segment 5.A line or segment that intersects the segment at its midpoint Ray 6.A set of two or more points all on the same line. Coplanar points 7.The set of all possible points. Betweenness of points 8.The distance between the endpoints of a segment Length of a segment 9.The set of two different endpoints and all points between them. Collinear points 10.Point B is between A and C if A, B, and C are collinear and the equation AB BC = AC is true, where AB, BC, and AC are the distances between points A and B, B and C, and A and C, respectively. Bisector of a segment