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" ... may be demonstrated from what has been said of the pentagon : and likewise a circle may be inscribed in a given equilateral and equiangular hexagon, and circumscribed about it, by a method like to that used for the pentagon. "
The Elements of Euclid, the parts read in the University of Cambridge [book ... - Page 146
by Euclides - 1846
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A Text-book of Euclid's Elements for the Use of Schools, Book 1

Euclid - Euclid's Elements - 1904 - 488 pages
...pentagon may be shewn to be equal ; PROPOSITION 12. PROBLEM. To circumscribe a regular pentagon about a given circle. Let ABCD be the given circle. It is required to circumscribe a regular pentagon about the 0 ABCD. Construction. Inscribe a regular pentagon in the...
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