Euclid's Elements - Book 8, Proposition 13
Proposition: If A:B = B:C then A^2:B^2 = B^2:C^2, and A^3:B^3 = B^3:C^3 PDFs: https://github.com/sandy-bultena/Eucl...

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Euclid's Elements - Book 8, Proposition 14

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Euclid's Elements, Book VIII, Proposition 13 (VIII.13)

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