Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 263
D, in which the angle,4 = 120°, B = 60°, C = 150°, and D = 30°; and the sideAB = 4 chains, BC = 4 chains, CD = 6.928 chains, and DA =8 chains. Keep three decimal places, and use the Traverse Table. 2. Find the area of the farm ABCDE, in which the angleA = 106° 19, B = 99° 40, C = 120° 20, D = 86°… … LAND SURVEYING 275 General Remarks on determining Areas. Operations depend-ing upon the reading of the magnetic needle must lackaccuracy. Hence, when great accuracy is required (which isseldom the case in land surveying) the method of pp. 266-269cannot be employed. The best results are obtained by…
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