Answer:
1 is congruent to 2 due to vertical angles
3 is congruent to 4 due to vertical angles
therefore, if 1 is congruent to 4, 3 must be congruent to 2
another way to do it is:
2 and 3 are congruent due to opposite interior angles
Explanation:
This is hard for me as well, but I'm very certain this is right.
I'm really sorry it took 2 hours for someone to answer it, but if you still need it, I hoped this helped! :D