Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 205
ar DC, which measures the altitude of the point Dabove the horizontal plane BC. Let us suppose that we have foundBA - 780 yards, the horizontal angle CBA = 41° 24,the horizontal angle CAB = 96° 28, and the angle of eleva-tion DBC= 10° 43. In the triangle BCA, to rind the horizontal distance BC. The… … In the right-ano-led triangle DEC, to find DC. As R ar. coin p. 0.000000 DEC 10° 43 9.27704 3 BC 1155.29 3.0G2C9 2 DC 218.64 2.339735 tan Remark I. It might, at first, appear that the solution whichwe have given, requires that the points B and A should be inthe same horizontal plane; but it is…
Geometry · Plane trigonometry
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