Elements of geometry : containing the first six books of Euclid, with a supplement on the quadrature of the circle, and the geometry of solids : to which are added, Elements of plane and spherical geometry (1826)
Playfair, John, 1748-1819, Euclid · Philadelphia : Marot & Walter · leaf 100
ht lines FB,FA, FE : therelore, since BC is equal to CI), and CF common to thetriangles BCF, DCF, the two sides BC, CF are equal to the two DC,CI; and the angle BCF is equal to the angle DCF: therefore the baseBF is equal (4. \.) to the base FD, and the other angles to the otherangles, to which the… … of the anff!e CBF; therefore theantrip ABF i« equal to the angleCBF ; wherefore the angle ABC isbisertel hy the straight line BF: lathe same manner, it may he demnn-Btrateil that the angles BAE, AED,are bisected hy the straight linesAF, EF: from th«* point F draw(12. l.)FG, FH, Fk, PL, FVI ppr-tiHM…
Euclid's Elements · Geometry · Trigonometry
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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-308-201.webp)
