1. Lines
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Let's consider the given diagram.
We are told that line s is parallel to line t. We are also told the measures of two angles, m∠2=110∘ and m∠11=137∘. Let's add this information to our diagram.
To find the measure of ∠13, we will use the fact that when two lines intersect, vertical angles are formed on opposite sides of the point of intersection, and these angles are always congruent.