A treatise on special or elementary geometry (1877)
Olney, Edward, 1827-1887, Olney, Edward, 1827-1887. Elements of trigonometry, plane and spherical · New York : Sheldon · leaf 62
portional to three given lines. Solution.—I have the three given linesA, B, and C, and wish to find a fourth line ^such that Q A shall be to B as C is to X]ie fourth Um, i. d.,A : B : : C : fourth line. To do this, I draw two indefinite lines OXand OY, from a common point 0. On oneof these, as OX,… … Fig. 71. Oa : OcA : B Ob0 Od.OTD. N.B.—The order in which the lines are taken, and the loay of drawing the linesab and cd, are essential. The following directions will insure correctness : Layoff the FIRST a?id second on the same line, as on OX; and the third on theOTHER LINE, as on OY. Then join…
Geometry · Trigonometry
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