Proposition: 4.16: Inscribing Regular Pentakaidecagon in Circle
Euclid's Formulation
To inscribe an equilateral and equiangular fifteensided figure in a given circle.
* Let $ABCD$ be the given circle.
* So it is required to inscribe an equilateral and equiangular fifteensided figure in circle $ABCD$.
Modern Formulation
It is possible to inscribe a regular pentakaidecagon (regular $15$sided figure) in a given circle.
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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