1. Proving Lines Parallel
For which of the theorems involving parallel lines and transversals is the converse true?

2. Example 1 Vertical Angles Transitive Property
l || m
Converse of corresponding angles theorem

3. Example 2 Given Vertical Angles Transitive Property
Converse of corresponding angles
∠1 ≅ ∠5
l || m

4. Example 3 a || b, c || d Given Alternate Exterior Angles
Alternate Interior Angles
∠1 ≅ ∠13
Transitive Property

5. Example 4 a || b Given Linear pair Alternate Interior Angles
Substitution

6. Example 5 g || h, ∠1 ≅ ∠2 Given Corresponding angles
Transitive Property
p || r
Converse of corresponding angles