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 Related Terms
 Vertical Angles:  Two nonadjacent angles formed by intersecting lines or segments. Also called opposite angles.
Opposite Angles: Two nonadjacent angles formed by intersecting lines or segments. Also called vertical angles.
Adjacent Angles: Angles in the same plane that have a common vertex and a common side, but no common interior points.
Intersecting Lines: Two lines that cross each other. Lines intersect at one point unless the lines fall directly on top of each other (in which case they are essentially the same line and are sometimes called coincidental).
Congruent: Having the same size, shape and measure.
Angle: Region between two rays or the amount of rotation about a fixed point.