Geometry Definitions, Postulates, and Theorems
Jul 26, 2013 · Parallel Lines Theorem In a coordinate plane, two nonvertical lines are parallel IFF they have the same slope. Perpendicular Lines Theorem In a coordinate plane, two nonvertical lines are perpendicular IFF the product of their slopes is -1. Two-Transversals Proportionality Corollary If three or more parallel lines intersect two
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