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 Related Terms
 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.
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.
Corresponding Angles: Angles that have the same relative positions in geometric figures.
Vertical Angles: Two nonadjacent angles formed by intersecting lines or segments. Also called opposite angles.
Transversal: A line that crosses two or more lines.