Euclid's Elements Book 1: Proposition 15, Vertical Angles
This is the fifteenth proposition in Euclid's first book of The Elements. This proof focuses on the fact that vertical angles are equal to each other.
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Euclid's Elements: Book 1, Proposition 15
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Euclid's Elements Book 1: Proposition 14, Angles Formed By A Straight Line Converse
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