A treatise on special or elementary geometry (1877)
Olney, Edward, 1827-1887, Olney, Edward, 1827-1887. Elements of trigonometry, plane and spherical · New York : Sheldon · leaf 426
Be = a and draw ee; thenas before shown, the projection of the vertex Clies in ee. In like manner taking ^d — Ad = b,and drawing dd the projection of C lies in dd[.The intersection of the chords ee and dd is there-fore the projection of the vertex C. Finally,passing arcs through AC A and BCB, the… … EXAMPLES. 1. Given a = 100°, b = 80°, and c = 68°,to project the triangle. 2. Given a = 108°, b = 120°, and c = 25°,to project the triangle. See Fig. 41. 3. Given a = 120°, I? = 65°, and c = 40°,to project the triangle. 4. Given a = 150°, b = 140°, and c =170°, to project the triangle.
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-193-112.webp)
