1. Pairs of Lines and Angles
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The red line below is the transversal.
Corresponding angles
When looking at ∠ 1 and ∠ 5 we are classifying the angles using the red line below as the transversal. Let's isolate ∠ 1 and ∠ 5 in the figure.
The two angles are both to the left of the transversal and above their respective lines. Therefore, they are corresponding angles.