This Power Point lesson teaches the Ruler Postulate, Protractor Postulate, Segment Addition Postulate, and Angle Addition Postulate and includes examples of how each postulate can be used to solve problems in geometry. The following terms are also defined: coordinate, congruent segments, midpoint, angle (including vertex and sides), congruent angles, and angle classifications (acute, right, obtuse, and straight). These notes with step-by-step examples and illustrations help to scaffold student understanding of geometry.