New plane and spherical trigonometry, surveying, and navigation (1903)
Wentworth, G. A. (George Albert), 1835-1906 · Boston : Ginn & Company · leaf 135
9.99843 log sin 4° 2 = 8.84718 colog sin 50 = 1.83732 log h = 2.41532 h = 260.21.Also a = h cot 4° 2/, 126 PLANE TRIGONOMETRY. \ogh= 2.41532log cot 4° 2 = 11.15174loga = 3.56706a = 3690.3.Height of rock, 260.21 feet; dis-tance of ship, 3690.3 feet. 21. A man in a balloon observesthe angle of… … Can Let A and A be the first andsecond positions of the balloon, re-spectively, C and C the points onthe ground directly under A andA\ and B the object observed.Then A = 54° 30, A = 66° 46,CC = AA = 2£.a = h tan ^4,a = h tan ^4.a2 - a2 = (2*)2./i2tan2^i t= (2i)2.(21)2 A2 tan2 J. £2 = tan2 ^4/- tan2…
Trigonometry · Surveying · Navigation
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-35-48.webp)
