A treatise on special or elementary geometry (1877)
Olney, Edward, 1827-1887, Olney, Edward, 1827-1887. Elements of trigonometry, plane and spherical · New York : Sheldon · leaf 153
logous reasons. 133 ELEMENTARY PLANE GEOMETET. to the unknown angles. Thenthe polygon GFED can beapplied in the ordinary wayto GFED, / being placed in/, etc So also GABC canbe applied to GABC, begin-ning with g in its equal g.Hence, angle FGD = FGD,AGC=AGC; and, adding,FGD + AGC = FGD +AGO.… … SOG, ScH.—When the unknownangles are both separated from theunknown side, the polygons may ormay not be equal—the case is am-biguous. Thus, if C and E are theunknown angles and AH the un-known side, the polygons ABCDEFG,and ABCDEFG fulfill the condi-tions, but are not equal. By draw-ing CE, CA, and…
Geometry · Trigonometry
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