Can someone explain this to me?

Answer:
Step-by-step explanation:
In a set of parallel lines (where 2 of them are present), corresponding angles are the angles that have the same measure but are located at different intersections on different lines & is made with the intersection of the same transversal.
Here, the slightly slanted yet vertical line which intersects line s & line t is the transversal.
By looking at the figure, we can see that ∠ 7 is formed below ∠ 5 towards the left side. Similarly, by looking above, we can notice that ∠ 3 just like ∠ 7 is formed towards the left side of the figure below ∠ 1. So,
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Hope it helps!
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