# Geometry

 .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } Postulate 2-1 Through any 2 points there is exactly 1 line Postulate 2-2 Through any 3 collinear points there its exactly 1 plane Postulate 2-3 A line contains at least 2 points Postulate 2-4 A plane contains at least 3 points, not all on the same line Postulate 2-5 If 2 points lie on a plane, then the entire line containing those 2 points lies in that plane Postulate 2-6 2 lines intersect in exactly one point Postulate 2-7 2 planes intersect in a line Midpoint Theorem If M is mp of (segment) AB then (segment) AM is congruent to (segment) MB Ruler Postulate The points on any line or line segment can be paired with real numbers so that given any 2 points, A and B on a line, A corresponds to zero, and B corresponds to a positive real number Segment Addition Postulate If A, B and C are collinear and B is between A and C, then AB + BC= AC. If AB+BC=AC then B is between A and C. Theorem 2.2 Congruence of segments is reflexive, symmetric & transitive Protractor Postulate Given (ray) AB and a number r between 0 and 180, there is exactly one ray with endpoint A, extending on either side of (ray) AB, such that the measure of the angle formed is r. Angle Addition Postulate If R is in the interior of