International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 127
bined area of which is equal to the area ofthe polygon. From the vertexes A, B, D, and F drop theperpendiculars A 6, B If, D K, and F L upon the oppositebases of the triangles. The lengths of the several bases andaltitudes are measured with the scale and the areas of theseveral triangles calculated… … Fig. 310. 1327. By Dividing the Plat into Trapezoids.—A plat of the area having been made, it may be resolved into
Railroad engineering
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