If <1 and <5 are congruent, it means that they have the same measure. In this case, we can use the angle-angle criterion to prove that two lines are parallel.
If two lines have corresponding angles that are congruent, then the lines are parallel. So, any pair of lines that have corresponding angles congruent to <1 and <5 will be proven parallel.
Given that <1 and <5 are congruent, which lines can be proven parallel
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