Parallel lines cut by a transversal form congruent alternate interior angles.
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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.
Yes. Alternate interior and alternate exterior angles are congruent.
It is the transversal line that cuts through parallel lines creating alternate equal angles.
If a transversal intersects a pair of lines and the alternate angles are congruent, the lines are parallel.
a transversal line If a transversal intersects two parallel lines, then the alternate interior angles are congruent.