Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 251
ing always written first. Thus, Px (Fig. 34) is the point (3, 4), P2 the point(— 3, 4), P3 the point (— 3, — 4), and P4 the point (3, — 4).In general the point whose co-ordinates are x and y is thepoint (x, y). 262 SURVEYING This system of co-ordinates may be applied to the determi-nation of areas… … and designate them as follows: for A, (xly yt) ; for B, (.r2, y2);for C, (x3,y3) ; for D, (<r4, y4) ; for E, (xs, y6). Evidently eachof these co-ordinates is positive. Then, area ABCDE = area LABM + area MBCP + area PCDR — area NEDR — area LA EN; or, in terms of the co-ordinates, area A BCDE = j…
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