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 Related Terms
Opposite Angles:  Two nonadjacent angles formed by intersecting lines or segments. Also called vertical angles.
 Angle: Region between two rays or the amount of rotation about a fixed point. Adjacent Angles: Angles in the same plane that have a common vertex and a common side, but no common interior points. Alternate Exterior Angles: Alternate exterior angles are pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on opposite sides of the transversal and are outside the other two lines. Alternate Interior Angles: Alternate interior angles are pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on opposite sides of the transversal and are in between the other two lines. Complementary Angles: Complementary angles are two angles whose sum is 90 degrees. Corresponding Angles: Angles that have the same relative positions in geometric figures. Supplementary Angles: Supplementary angles are two angles whose sum is 180 degrees. Transversal: A line that crosses two or more lines. Vertical Angles: Two nonadjacent angles formed by intersecting lines or segments. Also called opposite angles. Congruent Angles: Angles that have exactly the same measures.