Question

What is the relationship of the second statement to the first?

If two lines are not parallel, then a pair of corresponding angles are not congruent.
If a pair of corresponding angles are congruent, then two lines are parallel.

A. Same statement (conditional)
B. Converse
C. Inverse
D. Contrapositive

Answer 1

If you have a statement like "If A, then B", then the definitions of all those are:

Converse: "If B, then A"
Inverse: "If not A, then not B"
Contrapositive: "If not B, then not A"

In this case, you have the contrapositive.