


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.


