New plane and spherical trigonometry, surveying, and navigation (1903)
Wentworth, G. A. (George Albert), 1835-1906 · Boston : Ginn & Company · leaf 145
he windows,and C the top of the steeple. Thengiven c = 18, A = 50°, B = 127° 30;required height of steeple. h = b sin 40°. C = 180° - (A + B) = 2° 30. sin B 18 sin 127° 30 ft =18 sin C sin 2° 30 sin 127° 30 sin 40° sin 2° 30 log 18 = 1.25527 log sin 127° 30= 9.89947 log sin 40° = 9.80807 colog sin… … Let A and B be the inaccessibleobjects, C and D the extremities ofthe given line. Then, given CD,ACD, BCD, ADC, and BDC; re-quired A B. AC= CD BC = CD sin ADC sin CAD sin BDC sin CBDThen, in the triangle CAB, twosides and the included angle areknown, and the third side can becomputed as usual. 50.…
Trigonometry · Surveying · Navigation
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