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 168
t angles, which is impossible. Again,if one angle in one triangle equals thecorresponding angle in the other, as A= A, and the other angles are supple-mentary, the sum is 4 right angles plustwice the equal angle, which is impossible. Hence, two of the angles of one^triangle must be equal… … PROPOSITION IV. ^42, OrJieorem.—Two triangles, which have an angle in eachequal, and the sides about the equal a7iglesproportional, are similat. 148 ELEMENTAEY PLANE GEOMETRY.
Geometry · Trigonometry
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