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 440
Fig. 58. this side,produced, as the case may be. There are thus formed two rightangled triangles, as BDC and DC A, each of which can be solved by Napiers 88 SPHERICAL TRIGONOMETRY. rules, by first solving the one containing the given angle. Thus, in the triangleBDC right angled at D, a and B are…
Geometry · Trigonometry
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