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alternate interior angles

Alternate Interior Angles

In the drawing below, angles 3 and 6 are alternate interior angles, as are angles 4 and 5. Alternate interior angles are congruent. Formally, alternate interior angles are two interior angles which lie on different parallel lines and on opposite sides of a transversal.

 

Parallel lines cut
by a transversal

 

See also

Alternate exterior angles, consecutive interior angles

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