..

12. The best reason for statements 3, 5, and 7 in this proof is13. The best statement for reason 6 of this proof is

- Theorem 3.1.
Alternate interior angles are congruent.- Theorem 3.2.
Corresponding angles are congruent.- Theorem 3.3.
Alternate exterior angles are congruent.Theorem 3.4.Interior angles on the same side of the transversal are supplements.14. The best statement for reason 8 of this proof is

- and are supplements.
(3.) This one

- and are supplements.
(4.) This one