A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 170
, we shall find the area ofthe trapezoid to be a south product, andthe areas of the triangles to be north prod-ucts. The difference of the north productsand the south products is therefore the de-sired area of the three-sided field ABC. Using the double longitudes (in order toavoid fractions) in… … 156 LAND-SURVEYING. before, it is seen, on inspection, that its area would be obtainedby taking the two triangles, ABE, ADG, from the figureE B C D G E, or from the sum of the two trapezoids E B C F andFCDG. The area of the triangle A E B will be found, as in the lastarticle, to be equal to the…
Surveying
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