Parallel lines can have a line crossing both of them. They call that the transversal. Corresponding angles are on the same side of the transversal. Alternate are on opposite sides of the transversal.
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Corresponding or alternate exterior.
corresponding angles are equal and alternate angles are equal
They are equal corresponding angles and equal alternate angles
The angles formed are supplementary, equal corresponding and equal alternate angles
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.