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 143
nd E have BA and ED parallel, and extending in the same direction from thevertices, and also BC and EF;then are B and E equal. For,produce (if necessary) either twosides which are not parallel, tillthey intersect, as at H; then arethe corresponding angles DHC andDEF, and DHC and ABC equaJ{152).… … CFig. 201,an opposite direction from PD; then are B and E equal sary) two of the sides which are not parallel till they intersect, as at H; thenDHB = the corresponding angle DEF, and also = the alternate interiorangle ABC; whence ABC = DEF. q. E. D. EQUALITY OF ANGLES. 123 PROPOSITION IV. 282*…
Geometry · Trigonometry
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