Proposition: Prop. 11.01: Straight Line cannot be in Two Planes
(Proposition 1 from Book 1 of Euclid's “Elements”)
Some part of a straight line cannot be in a reference plane, and some part in a more elevated (plane).
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Table of Contents
Proofs: 1 2 3 4
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