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 86
^ toboth,AE.EC+EG^+GF^=AG3+GF^ Now EG^ + GF^ = EF^, andAG«4-GF^=AF^; therefore AE.EC+EF2=AF3=FB^ Bat FB^ =BE.ED + (5.2.)EF^there^orf AE.EC+EF^=BE.ED+£F«,andtaking EF^ from both, AE.EC.=BE.ED. Lastly, Let neither of the straight linesAC,BD pass through the centre: take thecentre F, and through E,…
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-66-43.webp)
