Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 192
192 GEOMETRY Sciiolium. Vertical angles, suchas ACO and BCN are equal ; foreither of them is still the angleformed by the two planes ACB,OCN. It is farther evident, that, in theintersection of two arcs ACB, OCN,the two adjacent angles ACO, OCB,taken together, are equal to tworight angles. … PROPOSITION VII. THEOREM. If from the vertices of the three angles of a spherical triangle, aspoles, three a?cs be described forming a second triangle, thevertices of the angles of this second triangle, will be respectivelypoles of the sides of the first. From the vertices A, B. C,as poles, let the…
Trigonometry · Geometry
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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-60-36.webp)
