Proof: By Euclid

(related to Proposition: 4.12: Circumscribing Regular Pentagon about Circle)


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References

Adapted from (subject to copyright, with kind permission)

  1. Fitzpatrick, Richard: Euclid's "Elements of Geometry"

Footnotes


  1. Presumably, by finding the center of the circle [Prop. 3.1] ":https://www.bookofproofs.org/branches/finding-the-center-of-a-given-circle/, drawing straight lines between the center and points $A$, $B$, $C$, $D$, and $E$, and then drawing $GH$, $HK$, $KL$, $LM$, and $MG$ through thoses points, at right angles to the aforementioned straight line [Prop. 1.11] (translator's note).