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The best option for reason 9 of the proof is Theorem 3.1 Two lines intersected by a transversal are parallel if and only if alternate interior angles are congruent. Theorem 3.2 Two lines intersected by a transversal are parallel if and only if corresponding angles are congruent. Theorem 3.3 Two lines intersected by a transversal are parallel if and only if alternate exterior angles are congruent. http://is.byu.edu/courses/hs/999063041004/secure/imgs/l3speed_16-20_b.jpg
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