Euclid's Elements Book 1: Proposition 13, Angles Formed By A Straight Line
This is the thirteenth proposition in Euclid's first book of The Elements. This proof shows that when you have a straight line and another straight line coming off of the first one at a point, that the angles formed between those lines will always add up to two right angles.
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Euclid's Elements Book 1: Proposition 14, Angles Formed By A Straight Line Converse
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