Proposition: 4.13: Inscribing Circle in Regular Pentagon
Euclid's Formulation
To inscribe a circle in a given pentagon, which is equilateral and equiangular.
* Let $ABCDE$ be the given equilateral and equiangular pentagon.
* So it is required to inscribe a circle in pentagon $ABCDE$.
Modern Formulation
It is possible to inscribe a circle in a given regular pentagon.
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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