Yes. Alternate interior and alternate exterior angles are congruent.
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Parallel lines cut by a transversal form congruent alternate interior angles.
If a transversal intersects a pair of lines and the alternate angles are congruent, the lines are parallel.
No. They are congruent. However, if one of the alternate angles is equal to 45, yes they would be complementary, but otherwise, no.
The lines are parallel. When a transversal intersects two lines, corresponding angles, alternate interior angles, and alternate exterior angles are congruent only if the lines are parallel. This is a fundamental property of parallel lines and transversals in geometry.
It is the transversal line that cuts through parallel lines creating alternate equal angles.