Euclid:Proposition/IX/1

Proposition

In the words of Euclid:

If two similar plane numbers by multiplying one another make some number, the product will be square.

(The Elements: Book $\text{IX}$: Proposition $1$)

Sources

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