Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 328
ice, theymay be omitted in elementary geometry. The importantformula at this time is v .= \ irrh. As already stated,this proposition was discovered by Eudoxus of Cnidus(born ca. 407 B.C., died ca. 354 B.C.), a man who, asalready stated, was born poor, but who became one ofthe most illustrious and… … 1 The illustration is from Dupin, loc. cit. 318 THE TEACHING OF GEOMETRY An interesting case for a class to notice is that in whichthe upper base becomes zero and the frustum becomes acone, the proposition being still true. If the upper baseis equal to the lower base, the frustum becomes a…
Geometry
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