Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 44
C: then will thetwo chords AB, ED be equal to eachother Draw CF perpendicular to AB, andCG perpendicular to ED, and since theseperpendiculars measure the distances fromthe centre, they will be equal. Also drawCB and CE. Then, the two right angled triangles CFB and CEG having the hypothenuse CB… … 44 G E O M E T RY. Of the Cir
Geometry · Plane 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-298-193.webp)
