A system of geometry and trigonometry : with a treatise on surveying (1830)
Flint, Abel, 1765-1825, Gillet, George, Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Hartford : Cooke & Co. · leaf 49
s or ends, ac*cording as you are ascending or descending a hill ; whichpoint may be ascertained by a plummet and line. CASE II. To SURVEY A FIELD IN THE FORM OF A TRAPEZIUM. Measure the several sides, and a diagonal between two op-posite angles ; protract the field, and find the area by prob-lem… … SURVEYING. 45 To PROTRACT THIS TRAPEZIUM. Draw the side AB the given length ; with the diagonal AC28 and the side BC 11.70 describe cross arcs as at C, fromA and B as centres ; and the point of intersection will repre-sent that corner of the field : then, with the side CD 21.50 andthe side AD…
Surveying · Geometry · Trigonometry
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