Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn · leaf 63
ng always written first. Thus, Px (Fig. 34) is the point (3, 4), P2 the point(— 3, 4), P, 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). 54 SURVEYING This system of co-ordinates may be applied to the determi-nation of areas in… … and designate them as follows: for A, (x1} yd ; for B, (x2, y2);for C, (x3, y3) ; for D, (x±, y4) ; for E, (x5, yd- Evidently eachof these co-ordinates is positive. Then, area ABODE = area LABM + area MBCP + area PCDR — area NEDR — area LA EN; or, in terms of the co-ordinates, area ABODE = %(yx +…
Surveying
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