A treatise on surveying and navigation: uniting the theoretical, practical, and educational features of these subjects (1857)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst; Toledo, Anderson, Burr, & co. · leaf 55
■ Q. E. D. CA : CB=CE : CG or, b : a=B : sec.tfj Scholium. If the hypotenuse of a triangle is made radius, oneside is the sine of the angle opposite to it, and the other side is thecosine of the same angle. This is obvious from the triangle CDF.
Surveying · Navigation
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