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 434
Projection.*—Projecting the triangle upon the plane of the side c (102),we have, BCA, Fig. 51. [The student should givethe process.] Solution.—It is immaterial which of the re-quired parts we seek first. We will seek c. Nowthe three circular parts under consideration are c,comp«, and comp B. Comp B… … Fig. 51.Therefore tan c is —, and c > 90°. Computing by logarithms, log cos 80° 40 = 9.209992- log cot 105° 34 = 9.444947 = log tan c = 1.765045 Add 10 for tab. tan 10. 9.765045. .-. c = 149° 47 37 * It is recommendecl that the projection be given ahvays before the trigonometrical eolution.It is…
Geometry · Trigonometry
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