The elements of Euclid for the use of schools and colleges; comprising the first six books and portions of the eleventh and twelfth books; (1903)
Euclid, Todhunter, I. (Isaac), 1820-1884, ed. edt, Simson, Robert, 1687-1768, ed. edt · London; New York, Macmillan · leaf 208
circle of the triangle BFC. 10. AE and BC are tangents to the circum-circle of the triangle CFE. 11. ABCDE is a regular pentagon inscribed in a circle; the arcsAB, BC, CD, DE, and EA are bisected, and lines drawn parallel tothe sides of the inscribed pentagon. Prove that these lines form… … Construction. Let the angular points of a regular pentagon,inscribed in the circle, be A, B, C, D, E, so that the arcsAB, BC, CD, DE, EA are equal; and through the points A, B, C, D, E draw GrH, HK, KL,LM, MGr touching the circle. [IIL 17. The figure GHKLM shall be the pentagon required.Proof. (1)…
Euclid's Elements · Geometry · Mathematics, Greek
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-298-193.webp)
