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 453
FiG. 68. Fig. 69. scribed circle is described. Thus, nsmg the common notation, we have InFig. 68, AD = AD = \s — a, and angle PAD = \^\ whence tan PD sin AD = cot PAD x tan PD tan PAD or tan ^A = tan PD k ., [(l)Ai^]. .:k= tanPD. sin (^s — a) sin {{s — «)From Fig. 69, we have, AD = ic, and angle…
Geometry · Trigonometry
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