Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 85
34 GEOMETRY Of Triangles and Parallelogram j … other (Ax. 1). To each, add ED :then will CE be equal to DF. But since the line FC cuts thetwo parallels CB and DA, theangle BCE will be equal to theangle ADF (Bk. I. Th. xiv): hence, the two triangles ADFand BCE have two sides and the included angle of the oneequal to two sides and the included…
Geometry · Plane trigonometry
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