International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 127
Fig. 310. 1327. By Dividing the Plat into Trapezoids.—A plat of the area having been made, it may be resolved into … trapezoids by either of the methods shown in Figs. 317 and318. In Fig. 317 the line A N is drawn parallel to^ C, andthe lines B M, K H, and E L are drawn perpendicular toA //, dividing the figure into trapezoids and the triangleH D K. The area of each trapezoid is equal to one-half thesum of its…
Railroad engineering
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