Answer: In Exercises 112, write a two-column proof or a flowchart proof of the
Chapter 13, Problem 12(choose chapter or problem)
In Exercises 112, write a two-column proof or a flowchart proof of the conjecture. Once you have completed the proofs, add the theorems to your list. If two parallel lines are intersected by a second pair of parallel lines that are the same distance apart as the first pair, then the parallelogram formed is a rhombus. (Double-Edged Straightedge Theorem)
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