Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 99
98 G E0METH1 Proportions of T r.i angles. AC AC … DF; but by hypothesis, BC : EF : : AB : DE:hence, EG is equal to £D. By the last theorem we alsohave BC : EF : : and by hypothesis, BC : EF : :hence, FG is equal to DF. Therefore, the triangles DEF and EGF, having their threesides equal, each to each, are equiangular (Bk. I. Th. viii).But, by…
Geometry · Plane trigonometry
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