New plane and spherical trigonometry, surveying, and navigation (1903)
Wentworth, G. A. (George Albert), 1835-1906 · Boston : Ginn & Company · leaf 135
cos -4/ cos J.__ sin (A + J.) sin (A - A) cos2 A cos2 ^1 Hence h = 21 cos J.7 cos A Vsin (^4/ + ^.) sin (A - A) log 21- 0.39794 log cos ^.7 = 9.59602 log cos A = 9.76395 colog Vsin (J/ + ^4) = 0.03408 colog Vsin (A - A) = 0.33636 log h = 0.12835 h = 1.3438. Height of balloon, 1.3438 miles. 22. A… … Let AC be the tower, B and B/the first and second positions of theobserver. Then BB = 100. ■a = b cot ABG, TEACHERS EDITION. 127 a = b cot ABC.a2 - a2 = a2.b2 (cot2 ABC - cot2 ABC) = 1002. 100 o = Vcot2 50° 8 - cot2 54° W_ 100 sin 54° W sin 50° 8 Vsin 104° 24 sin 4° 8 log 100 = 2.00000 log sin 54°…
Trigonometry · Surveying · Navigation
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