Question

∠1 and ∠2 are ___. alternate interior angles corresponding angles alternate exterior angles supplementary angles

Explanation:

Alternate exterior angles are formed when a transversal crosses two parallel lines. They are on opposite sides of the transversal and outside the two lines. In the given diagram, ∠1 and ∠2 fit this definition.
Corresponding angles are in matching positions. Alternate interior angles are between the two lines. Supplementary angles add up to 180°, which isn't indicated here.

Answer:

Alternate Exterior Angles