Euclid's Elements Book 1, Proposition 13
Project Euclid presents Euclid's Elements, Book 1, Proposition 13 "If a straight line stands on a straight line, then it makes either two right angles or angles whose sum equals two right angles." Presented by Andrea Fiegel, St. John's College, Class of 2015

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Euclid's Elements Book 1, Proposition 14

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Euclid's Elements Book 1: Proposition 24

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Euclid's "Elements" - Book 1, Proposition 13

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Euclid's Elements: Book 1, Proposition 15

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Euclid's Elements Book 1: Proposition 5, Isosceles Triangles

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Euclid's Elements Book 1, Proposition 29

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Euclid's Elements Book 1: Proposition 11, Constructing A Perpendicular Line

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Euclid's Elements: Book 1, Prop 16

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Euclid's Elements Book 2: Proposition 6

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Euclid's Elements Book 1: Proposition 29, Parallel Lines Converse

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