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 147
than AC, it must be equal to orgreater than the pei-pendicular CI(= FH) in order to have a triangle.Then, applying AC to DF, and ob-serving that AB takes the directionDE, and that EF, which = CB, beingintermediate in length between DFand FH, may lie on either side ofFH, we see that ABC may or… … EQUALITY OF TRIANGLES. 127 PROPOSITION IX. 292,17ieore^n.—Tiuo triangles wliich have the three sides ofthe one equal to the three sides of the other, each to each, are equal.
Geometry · Trigonometry
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