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New plane and spherical trigonometry, surveying, and navigation (1903)
Wentworth, G. A. (George Albert), 1835-1906 · Boston : Ginn & Company · leaf 148
= 2 BAB. 2 tan BAB .-. tan ABA ■. AA120 1 - tan2 BABnBB 120 BBZ1202 240 BW 1202 - BB2 AA(1202-BB2) = 120 x 240 BB. ^?(1202-RB2) = 120 x 240 BB.BB 1202 - BR2 = 8 BR2. BR2 = 402. BB = 40. AA = 90. Heights of towers, 90 feet and 40 feet. 57. To find the distance of aninaccessible point C from either… … In the triangle aAB,s = ^-(500 + 100 + 560): 580. •4 80x480 10 tan 4- aAB ? \580x20 log 96= 1.98227 colog 29 = 8.53760 2) 0.51987 log tan £ aAB = 10.25993 iaAB= 61°12/20//. aAB = 122° 24/ 40. CAB= 57°35/20. In the triangle bAB,s = i (500 + 550 + 100) = 575. 140 PLANE TRIGONOMETRY. tan^2M = J75x475…Trigonometry · Surveying · Navigation
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