Answer:
15. A
16. B
17. B
18. C
Step-by-step explanation:
The onion skin math method helps you understand
I love you, y
1) Either or ∦ (only two possibilities)
2) Assume (one of two possibilities)
3) (if two parallel lines are cut by a transversal, the corresponding angles are congruent)
4) But is not congruent to (given)
5) So ∦ (only other possibility)