Euclid's Elements Book 1: Proposition 42, Constructing a Parallelogram
This is the forty second proposition in Euclid's first book of The Elements. This construction proof shows that you can build a parallelogram that is equal in area to a given triangle and contains an angle equal to one that was given.
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Euclid's Elements Book 1: Proposition 43, Complements of a Parallelogram
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Euclid's Elements Book 1: Proposition 44, Constructing a Parallelogram 2
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Euclid's Elements Book 1: Proposition 45, Parallelograms and Quadrilaterals
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Euclid's Elements Book 1: Proposition 35, Parallelogram Area
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