Two parallel lines are intersected by a third line so that angles 1 and 5 are congruent. which statement is true about angles 3 and 5?

Angles 3 and 5 are supplementary.

This is because of the Same-Side Interior Angles Theorem, stating that if two parallel lines are cut by a transversal, the interior angles on the same side are supplementary (adding up to 180).

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