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### 56 Cards in this Set

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 Addition property of equality If a = b, then a + c = b + c Line Intersection Theorem Two different lines intersect in at most one point. p.43 Linear Pair Theorem If two angles form a linear pair, then they are supplementary. p.140 Vertical Angles Theorem: If two angles are vertical angles, then they have equal measures. p.141 Parallel Lines and Slopes Theorem Two nonvertical lines are parallel if and only if they have the same slope. p.158 Transitivity of Parallelism Theorem In a plane, if l m and m n, then l n. p. 158 Two Perpendiculars Theorem If two coplanar lines l and m are each perpendicular to the same lines, then they are parallel to each other. p. 162 Perpendicular to Parallels Theorem1 In a plane, if a line is perpendicular to one of two parallel lines, then it is also perpendicular to the other. Perpendicular Lines and Slopes Theorem Two nonvertical lines are pependicular if and only if the product of their slopes is -1. p.162 angle the union of two rays that have the same endpoint. p. 124 bisector VR is the bisector of 0, then ac < bc. If a < b and c < 0, then ac > bc. slope The slope of the line through (X1, Y1) and (X2, Y2), with X1 not equal to X2 is Y2 - Y1 X2 - X1 Circle- A circle is the set of all points in a plane at a certain distance, its radius, from a certain point, its center.