New plane and spherical trigonometry, surveying, and navigation (1903)
Wentworth, G. A. (George Albert), 1835-1906 · Boston : Ginn & Company · leaf 126
nd &i, b2, respectively. Now the area of the quadrilateralis equal to the sum of the areas ofthe four triangles. .-. F = \ axb2 sin C + £ a2b2 sin C -f i a2bi sin C + \ a{b\ sin C— ±(ciib2 + a2b2 + a2bi -f ai&i)sin C=i(ai + a2)(b1 + b2)sm C= iab sin C. Exercise XXII. Page 88. 1. From a ship… … Let A represent the Eddystone,C the first position of the ship, andB the second. a = 18 miles.ACE = ^°W.DCB = 67° 3CT.ABF= 11° 15. ACB = 180° -(ACE + DCB) = 78° 45.CBD = 90° - DCB = 22° 30.ABC = 90° - (CBD + ABF)= 56° 15... BAC = 45°. b _ sin Ba sin A log a — 1.25527 log sin B = 9.91985 colog sin A…
Trigonometry · Surveying · Navigation
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