A treatise on surveying and navigation: uniting the theoretical, practical, and educational features of these subjects (1857)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst; Toledo, Anderson, Burr, & co. · leaf 78
ides of a trapezium, and two of its opposite angles aregiven, the most convenient rule for finding its area is found inproblem III. Conceive CB joined, then the whole figureconsists of t-wo triangles and the whole areais found in the following expression(AB X ACX sm.A) + (CD X DB X sin.CDB.)… … To find the area of an irregular figure bounded by any numberof right lines. Rule. — Draw diagonals dividing the figure into triangles. Findthe areas of the triangles so formed and add them together for the areaof the whole. Let it be required to find thearea of the adjoining figure offive sides.…
Surveying · Navigation
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