Vertical angles are congruent. Two nonadjacent angles formed by two intersecting lines are vertical angles.

Answer:
A
Step-by-step explanation:
If two nonadjacent angles formed by two intersecting lines = Vertical angles= congruent
Then
Two non adjacent angles formed by two intersecting lines are congruent
Answer:
a
Step-by-step explanation:
Two non adjacent angles formed by two intersecting lines are vertical angles.