The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 193
atthe corners A, B, C, and D, and indefinitely extended, be cut bya right line in four points, as E, F, G, and H, then these latterpoints will lie in a straight line for all values of each of theparallelogram angles from zero to 180°, and the ratio of the dis-tances EF, EG, and GH will remain… … Fig. 40. the angles of the parallelogram change. Let this point be G,Since GC and GH, radiating from G, cut the parallel linesDE and CH^ we have GD\DE :: GC: CH. : Also, for similar reasons, ED\DG\\EA\AF. Now since the sides of the parallelogram, as well as all theintercepts, AF, GD, DE, and CH,…
Surveying
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