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 258
sin. (AB+AC): sin. (AI? - AC) :: cot. d BAC: tan. | (BAD - CAD),when AD falls within ; but when AD falls without the triansjle,sin. (AB+AC) : sin. (AB - AC) :: cot. I BAC : tan. h (BAD + CAD).For in the triangle BAC (37.), tan. B : tan.C :: sin. CD : sin.BD,andtherefore(E.0.),tan. C+tan.B :…
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-61-37.webp)
