A treatise on surveying and navigation: uniting the theoretical, the practical, and the educational features of these subjects (1852)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst · leaf 57
> Q. E. D. CA : CB=CE : CG or, b : a=B : sec.CJ 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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