New plane and spherical trigonometry, surveying, and navigation (1903)
Wentworth, G. A. (George Albert), 1835-1906 · Boston : Ginn & Company · leaf 58
77 = 9.79887= 2.54864 : tan 51°. : DC tan 51°. : 2.54864 : 10.09163 - 10 2.64027: 436.79. = tan 40°. = DC tan 40°.= 2.54864= 9.92381= 2.47245 = 296.79. belfry to top offeet- 296.79 fe?t 66. The angle of elevation of thetop C of an inaccessible fort ob-served from a point A is 12°. Ata point J5, 219… … log AB = colog cot ABC =log AC =In rt. A ADC, CD _ AC~ .-. CD = \ogCD = \ogAC log AC = log sin CAD = log CD = CD = 2.340440.269772.61021 sin CAD. AC sin CAD.+ log sin CAD.2.610219.31788 - 10 1.9280984.74.Height of fort is 84.74 feet. Exercise X. Page 33. 1. In an isosceles triangle, givena and A ;…
Trigonometry · Surveying · Navigation
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