Our Points, Lines, Planes, and Angles Quick Reference Guide explains many of the definitions, postulates, and theorems that are found in a typical high school Geometry textbook and are associated with points, lines, planes, and angles. The topics discussed include:

The meanings of the terms point, line, and plane

Naming points, lines, planes, rays, and line segments

Collinear and coplanar points

The definitions of the terms midpoint, segment bisector, and congruent segments

The Segment Addition Postulate and the Midpoint Theorem

Naming angles

The definitions of the terms acute angle, right angle, obtuse angle, straight angle, congruent angles, angle bisector, perpendicular lines, vertical angles, and linear pair