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 55
Etc. 57. 84 ELEMENTARY GEOMETRY. TJieorem*- … ■Tlie lines drawn from the vertices of a triangleto the middle of the opposite sides meet in acommon point within the triangle, III.—Draw a triangle. Bisect each of the sidesas taught in {39). Tlien join eacli angle and themiddle of its opposite side with a straight line. Ifyou do the work well,…
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-67-45.webp)
