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Definition: Def. 11.16: Center of a Sphere

(Definition 16 from Book 11 of Euclid's “Elements”)

And the center of the sphere is the same as that of the semicircle (constructing the sphere).

Modern Formulation

(not yet contributed)

Mentioned in:

Definitions: 1
Proofs: 2

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