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Proposition: Prop. 11.03: Common Section of Two Planes is Straight Line

Euclid's Formulation

If two planes cut one another then their common section is a straight line.

• For let the two planes $AB$ and $BC$ cut one another, and let their common section be the line $DB$.
• I say that the line $DB$ is straight.

Modern Formulation

(not yet contributed)

Table of Contents

Proofs: 1

Mentioned in:

Proofs: 1 2 3

Thank you to the contributors under CC BY-SA 4.0!

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non-Github:

@Fitzpatrick

References

Adapted from (subject to copyright, with kind permission)

1. Fitzpatrick, Richard: Euclid's "Elements of Geometry"

Adapted from CC BY-SA 3.0 Sources:

1. Prime.mover and others: "Pr∞fWiki", https://proofwiki.org/wiki/Main_Page, 2016

Footnotes