For the given figure:
According to the statements provided, we will name the lines that are parallel to each other:
1) ∠1 ≅ ∠3; The parallel lines are (c, d)
2) ∠6 ≅ ∠9; the parallel lines are (a, b)
3) ∠6 is supplementary to ∠10; the parallel lines are (a, b)
4) ∠1 ≅ ∠11: Not enough info
5) ∠5 is supplementary to ∠8; the parallel lines are (c, d)
6) ∠3 ≅ ∠11; The parallel lines are (a, b)
7) ∠1 ≅ ∠6; Not enough info
8) ∠1 ≅ ∠14: the parallel lines are (a, b)
9) ∠15 is supplementary to ∠16; Not enough info
10) ∠13 ≅ ∠15; the parallel lines are (c, d)