1. Pairs of Lines and Angles
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The red line below is the transversal.
Alternate interior angles.
When looking at ∠ 2 and ∠ 11, we are classifying the angles using the red line below as the transversal. Let's isolate ∠ 2 and ∠ 11 in the figure.
The two angles are on opposite side of the transversal and between the two lines. Therefore, they are alternate interior angles.