Proposition: 3.13: Circles Touch at One Point at Most
(Proposition 13 from Book 3 of Euclid's “Elements”)
A circle does not touch a(nother) circle at more than one point, whether they touch internally or externally.
Two circles touch one another (internally or externally) at exactly one point.
Table of Contents
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Adapted from (subject to copyright, with kind permission)
- Fitzpatrick, Richard: Euclid's "Elements of Geometry"
Adapted from CC BY-SA 3.0 Sources:
- Prime.mover and others: "Pr∞fWiki", https://proofwiki.org/wiki/Main_Page, 2016