Line - a straight, continuous arrangement of infinitely many points
Point - a location with no size
Plane - A flat surface that has no thickness and extends infinitely in all directions.
Collinear - on the same line
Coplanar - on the same plane
Line segment - a part of a line between two endpoints
Ray - A part of a line, with one endpoint, that continues without end in one direction
Endpoints - A point at one end of a segment or the first point of a ray.
Midpoint - A point that divides a segment into two congruent segments
Bisects - Divides into two congruent (equal) parts
Segment Addition - If points A, B, and C are collinear and B is between A and C, then AB + BC = AC.