Question

Write a proof for the following situation. This proof can be a paragraph, flow chart proof or two column proof.

No matter which one you use, the proof should contain both statements that logically lead to the desired conclusion, as well as, the reasons those statements are justified. A two column proof has been started for you.
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Answer 1

Lines p and q are parallel and angles 1 and 9 are congruent because they are corresponding angles. Angles 1 and 11 are congruent by given. Since angles 9 and 11 are congruent to the same angle, angles 1, angles 9 and 11 are congruent by transitive or substitution. Lines a and b are parallel.