Point
A location (NO size/shape)
Line
Made up of two points (NO thickness/width)
Line Segment
Measurable part of a line (2 endpoints)
Ray
A line that extends in only one direction
Plane
Flat surface that extends in all directions (NEEDS 3 non-collinear points)
Collinear
Points on the same line
Coplanar
Points in same plane
Midpoint
Point that is equal distance from both endpoints (ONLY line-segments)
Congruent Segments
Have same length
Segment Addition Postulate
If B is between A and C, then AB + BC = AC