Two pairs of alternate opposite angles
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Alternate interior angles.
Alternate interior angles are equal on a transversal that passes through parallel lines.
they are alternate (which means opposite of) the transversal and they are INTERIOR (inside) the paralell lines
Parallel lines cut by a transversal form congruent alternate interior angles.
Providing that the lines are parallel that the transversal passes through then it will have two equal alternate angles that are on opposite sides of the transversal.