Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 12
endent. Trigonometry beginsby showing the exact nature of this dependence in the righttriangle, and for this purpose employs the ratios of its sides. Let MAN (Fig. 1) be an acute angle. If from any points B, D, F, in one of its sides perpendiculars BC, BE, FG, are let fall to the other side,… … AC_AE^AG,AB AD AF AC==AE=AGBC BE FG ; etc. TRIGONOMETRY. Hence, for every value of an acute angle A there are certainnumbers that express the values of the ratios of the sides inall right triangles that have this acute angle A.There are altogether six different ratios: I. The ratio of the opposite…
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