Corresponding
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corresponding angles
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.
They are equal corresponding angles.
supplementary
If you mean angles here is the answer: Two angles in the same relative position on two lines when those lines are cut by a transversal Corresponding: Respond, Same, Equal