What is the reason for the third step in this proof?
Given: a || b, and both lines are cut by transversal t.
Prove: 2 7
Proof:
Statement Reason
1. a || b given
2. 2 3 Vertical Angles Theorem
3. 3 6
4. 2 6 Transitive Property of Congruence
5. 6 7 Vertical Angles Theorem
6. 2 7 Transitive Property of Congruence
Transitive Property of Equality
Alternate Interior Angles Theorem
Corresponding Angles Theorem
Same-Side Interior Angles Theorem
Vertical Angles Theorem

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Well, what kind of angles are 3 and 6?

obtuse

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