For line b, d, and e, line d is parallel to line e and m∠1 = 81°.

part a: in complete sentences, explain the relationships between all pairs of special angles 1, 2, 3 and 4 created by transversal line b and parallel lines d and e.
part b: for the given diagram, use the measure of the following special angle relationships are created by transversal line b and parallel lines d and e : 1 to find the measures of ∠2, ∠3, and ∠4.