 | Sir John Leslie - Geometry, Plane - 1820 - 482 pages
...co((I80° _JBED— EBD); whence the angle EDB is given. Tile angles which the three objects A, B, and C subtend at the point D are therefore all given,...position of each of the stations E and F is determined. PROB. XXVII. i Given the angles of elevation at which an object is seen from three known points in... | |
 | Sir John Leslie - Geometry, Modern - 1820 - 488 pages
...cot(180° —JBED—EBD); whence the angle EDB is given.. The angles which the three objects A, B, and C subtend at the point D are therefore all given, and hence the posi- . tion of D is determined by the preceding proposition. But BD, being found, the several distances... | |
 | Sir J Butler Williams - Surveying - 1855 - 306 pages
...R : tan. b, and R : tan. (45° - b) : : cot. j BED : - cot. (j BED + EBD) or cot.(180°-lBED-EBD), whence the angle EDB is given. The angles which all...operation is somewhat too laborious for practice, in suchexceptional cases as this, when only two stations could be seen, the azimuth compass might be used,... | |
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EBD) or cot.(180°-lBED-EBD), whence the angle EDB is given. The angles which all the three objects, A, B, C, subtend at the point D are therefore all given, and hence the position of D is determined by the preceding proposition. But BD being found, the... 