Alternate interior angles.
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Angles on opposite sides of the transversal and between the parallel lines
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.
Those are "alternate interior" angles. They're always equal.
Alternate Exterior 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.