Plane trigonometry, and its application to mensuration and land surveying. Accompanied with all the necessary logarithmic and trigonometric tables (1852)
Perkins, George R. (George Roberts), 1812-1876 · New York, D. Appleton · leaf 75
Draw a sufficient number of diagonals to divide the wholefigure into triangles. Then compute each triangle separately,and take their sum. As an illustration, suppose ABCDEF to be the polygon. Draw the di-agonals EA, EB, EC, and suppose byactual measurement we find AB =12-5 ; BC = 11-25 ; CD = T ;… … u u area ABCDEF = 150-3115 §54.] MENSUKATION. 65
Plane trigonometry · Surveying
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