Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 168
, CF, BE, and FA, it is apparent that thisgeneral quadrilateral lias six vertices, A, B, C, I), F, F,and three diagonals, AD, BE, and CE. Such broaderideas of geometry form the basis of what is calledmodern elementary geometry. The other definitions of plane geometry need not bediscussed, since all… … 158 THE TEACHING OF GEOMETRY greatest skill, but they are more teachable to beginners,and are, on the whole, more satisfactory from the educa-tional standpoint. The greatest lesson to be learned fromthis discussion is that the number of basal definitions tobe learned for subsequent use is very…
Geometry
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