Euclid:Proposition/VIII/11

Proposition

In the words of Euclid:

Between two square numbers there is one mean proportional number, and the square has to the square the ratio duplicate of that which the side has to the side.

(The Elements: Book $\text{VIII}$: Proposition $11$)

Sources

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