Answer :
1.
[tex]m\angle12=m\angle1 = 55^{\circ} \Rightarrow A[/tex] because those are alternate exterior angles.
2. OK
3. It's C
[tex]m\angle12=m\angle1 = 55^{\circ} \Rightarrow A[/tex] because those are alternate exterior angles.
2. OK
3. It's C