Proposition: Prop. 9.01: Product of Similar Plane Numbers is Square

(Proposition 1 from Book 9 of Euclid's “Elements”)

If two similar plane numbers make some (number by) multiplying one another then the created (number) will be square.

Modern Formulation

Proofs: 1

Proofs: 1


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

Github:
bookofproofs
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