Another way to summarize this proof is to say vertical angles are congruent.
Vertical angles
Lines are shortest distance between two point and angles are forned from the intersection of two lines.
From the given figure, they are trying to prove that the angles ANR and VNE are equal. Since these angles are formed at the point of intersection, hence another way to summarize this proof is to say vertical angles are congruent.
Learn more on vertical angles here: https://brainly.com/question/14362353
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