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What would be the reason for the second and third line of the proof?
Because the sum of all angles in a triangle is 180°
Because vertical angles are congruent
Because alternate interior angles are congruent
Because both angles are supplementary

What would be the reason for the second and third line of the proof Because the sum of all angles in a triangle is 180 Because vertical angles are congruent Bec class=

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Answer:

Because alternate exterior angles are congruent

Step-by-step explanation: