Euclid:Proposition/V/19/Porism

Proposition

In the words of Euclid:

From this it is manifest that, if magnitudes be proportional componendo, they will also be proportional convertendo.

(The Elements: Book $\text{V}$: )


Sources

  • 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 2 (2nd ed.) ... (previous) ... (next): Book $\text{V}$. Propositions
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