(I.27) Lines are Parallel when Alternate Interior Angles are Congruent, Proof
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In proposition 27 of Euclid's Elements, we prove that if two straight lines are intersected by a third line making the alternate interior angles congruent to each other, then the two straight lines must be parallel.
Playlist of Euclid's Elements in link below:
• Euclid's Elements Book 1
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