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 155
fromC to A, and thence to D :mark that point of the linewhich touches the stake atA. Remove the line, andexchange ends; that is, fast-en to the stake D the end which was first made fast at C, andfasten upon C the end D; then, taking hold of the line at thepoint which was in contact with A, stretch… … ,n oj.] SURVEYING. 145 FB. The two triangles FDG and BAG are similar, since theangles ABG and DFG are alternate in reference to the parallelsBC, PF, and are therefore equal (Geom., B. I., Prop. XVII.);also the angle AGB is equal to FGD, being opposite angles(Geometry, B. I., Prop. II.). These two…
Plane trigonometry · Surveying
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