Proposition: 6.30: Construction of the Inverse Golden Section
(Proposition 30 from Book 6 of Euclid's “Elements”)
To cut^{1} a given finite straight line in extreme and mean ratio.
Modern Formulation
It is possible to cut a given segment at a point being its inverse golden ratio.
Table of Contents
Proofs: 1
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References
Adapted from (subject to copyright, with kind permission)
 Fitzpatrick, Richard: Euclid's "Elements of Geometry"
Adapted from CC BYSA 3.0 Sources:
 Prime.mover and others: "Pr∞fWiki", https://proofwiki.org/wiki/Main_Page, 2016
Footnotes