1. Pairs of Lines and Angles
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The red line below is the transversal.
Consecutive interior angles
When looking at ∠11 and ∠13, we are classifying the angles using the red line below as the transversal. Let's isolate ∠11 and ∠13 in the figure.
The two angles are both to the left of the transversal and between the two lines. Therefore, they are consecutive interior angles.