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.