Euclid's Elements Book 1: Proposition 23, Constructing An Angle
This is the twenty third proposition in Euclid's first book of The Elements. This construction proof shows that you can duplicate a given angle on a given line.

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Euclid's Elements Book 1: Proposition 24

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Euclid's Elements Book 1: Proposition 28 Part 1, Parallel Lines 2

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Euclid's Elements Book 1: Proposition 26 Part 1, Angle Side Angle Theorem

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Euclid's Elements Book 1: Proposition 27, Parallel Lines 1

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Euclid's Elements: Book 3, Prop 14

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Euclid's "Elements" - Book 1, Proposition 23

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

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