Euclid:Proposition/XI/23

Proposition

In the words of Euclid:

To construct a solid angle out of three plane angles two of which, taken together in any manner, are greater than the remaining one: this the three angles must be less than four right angles.

(The Elements: Book $\text{XI}$: Proposition $23$)

Sources

• 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 3 (2nd ed.) ... (previous) ... (next): Book $\text{XI}$. Propositions