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 145
DEF directly, as in {85). Themethod here given is used for the purpose of uniformity in this and the follow-ing. We may observe that in this, as in the other cases, DB is perpendicular toPC, and bisects it at 0. This fact might easily be shown, and the demonstra-tion be based upon it 2S5. ScH.—This… … Fig. 204. PROPOSITION TIL 286. Theorem.—Tiuo triangles ivhich have two angles and theincluded side of the one equal to two angles a7id the included side ofthe other, each to each, are equal. EQUALITY OF TRIANGLES. 125
Geometry · Trigonometry
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