 From a station B at the base of a mountain its summit A is seen at an elevation of 60°; after walking one mile towards the summit up a plane making an angle of 30° with the horizon to another station C, the angle BCA is observed to be 135°.  Plane and Spherical Trigonometry - Page 93by Henry Nathan Wheeler - 1876 - 208 pagesFull view - About this book
 | Association of Ontario Land Surveyors - Surveying - 1907 - 218 pages
...Cosec A. 4. Prove Sin 2.^ = 2 Sin A Cos A, and Cos 2^ = Cos2 A - Sin2 .4=1-2 Sin" A = 2 Cos2 A -I. 5. From a station B at the base of a mountain its summit...60°; after walking one mile towards the summit up a plain making an angle of 30° with the horizon to another station C the angle BCA is found to be 135*.... | |
 | University of Calcutta - 1914 - 822 pages
...inches, find the diameter of the other end. 5. From a station В at the base of a mountain, its summit is seen at an elevation of 60° ; after walking one...mile towards the summit up a plane making an angle of 25° with horizon to another station C, the angle BCA in observed to be 130°. Find the height of the... | |
 | University of Cambridge - Universities and colleges - 1831 - 510 pages
...rectum L A Cf meet the axis in T; shew that -^ = the eccentricity. 2. From a station B at the hase of a mountain its summit A is seen at an elevation...walking one mile towards the summit up a plane making 30" with the horizon, to another station C, the angle BCA is observed to be 135«. Find the height... | |
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