To determine what type of relationship the pair of highlighted angles has, we should consider the types of angles pairs that can be formed by a transversal. Let's examine the given angles ∠ 4 and ∠ 5.
From the diagram, we can see that the angles ∠ 4 and ∠ 5 are both exterior. Moreover, they lie on the opposite side of the transversal. They must be alternate exterior angles.
