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a segment line ray or plane that is perpendicular to a segment at it's midpoint
reasoning in which all possibilities are considered and all but one are proved false
proves if two sides and the angle between them are congruent in a pair of triangles, the triangles are congruent
proves if two angles and the side they share are congruent in a pair of congruent triangles, the triangles are congruent
proves if two angles and a non-included side are congruent in a pair of triangles, the triangles are congruent
alternate exterior angles
angles that lie outside of the lines on the opposite sides of a transversal
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