list all angles that are congruent to angle 1.
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Because lines x and y are parallel, angle 5 is the angle congruent to angle 1.
Two angles are congruent if they have the same measure.
Now, notice that lines x and y are parallel between them, then the angles formed in one intersection are congruent to the correspondent angles in the other intersection.
This means that 6 and 2 are congruent, 7 and 3 are congruent, 4 and 8 are congruent, and finally, 1 and 5 are congruent.
So we conclude that the congruent angle to angle 1, is angle 5.
If you want to learn more about congruent angles:
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