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alternate exterior angles

Alternate Exterior Angles

In the drawing below, angles 1 and 8 are alternate exterior angles, as are angles 2 and 7. Alternate exterior angles are congruent. Formally, alternate exterior angles are defined as two exterior angles on opposite sides of a transversal which lie on different parallel lines.

 

Parallel lines cut
by a transversal

 

See also

Alternate interior angles, consecutive interior angles

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