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 Related Terms
 Linear Pair:  Two adjacent angles that form a straight line.
Supplementary Angles: Supplementary angles are two angles whose sum is 180 degrees.
Adjacent Angles: Angles in the same plane that have a common vertex and a common side, but no common interior points.
Angle: Region between two rays or the amount of rotation about a fixed point.
Straight Angle: A straight angle is formed by a straight line and measures exactly 180 degrees