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Chapter Three
Linear Pair Theorem: If two angles from a linear pair, then they are supplementary.

Vertical Angles Theorem: If two angles are vertical angles, then they have equal measures.

Parallel Lines and Slopes Theorem: Two nonvertical lines are parallel if and only if they have the same slope.

Transitivity of Parallelism Theorem: In a plane, if L // M and M // N, then L // N.

Two Perpendiculars Theorem: If two coplanar lines L and M are each perpendicular to the same line, then they are parallel to each other.

Perpendicular to parallels Theorem: Inn a plane, if a line is perpendicular to one of the two parallel lines, then it is also perpendicular to the other.

Perpendicular Lines and slopes Theorem: Two nonvertical lines are perpendicular if and only if the product of their slopes is -1
Last updated  2008/09/28 10:12:02 PDTHits  132