Only if the lines cut by the transversal are parallel.
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If two lines are cut by a transversal to form pairs of congruent corresponding angles, congruent alternate interior angles, or congruent alternate exterior angles, then the lines are parallel.
Same-side interior angles are supplementary. They are not always congruent, but in a regular polygon adjacent angles are congruent.
A. Corresponding parts of similar triangles are similar.B. Alternate interior angles are supplementary.C. Alternate interior angles are congruent.D. Corresponding parts of congruent triangles are congruent
Then the lines are parallel to each other and the alternate equal angles are created when a transversal line cuts through parallel lines.
Both alternate interior and alternate exterior angle pairs lie on opposite sides of the transversal.