Definition:Euclid's Definitions - Book III/3 - Tangent Circles

Definition

In the words of Euclid:

Circles are said to touch one another which, meeting one another, do not cut one another.

(The Elements: Book $\text{III}$: Definition $3$)

Sources

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