Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 151
r thanthat of the two pyramids: which, by supposition, differ bythe prism a—ABC: hence, the prism BCA—D, must begreater than the prism a—ABC. But in reality it is less, foithey have the same base ABC, and the altitude Ax, of thefirst, is less than Aa, the altitude of the second. Hence, thesupposed… … THEOREM XVI. Every triangular pyramid is a third part of a tmangulai prismwhich has an equal base and the same altitude. Let F—ABC be a trian-gular pyramid, ABC—DEFa triangular prism of thesame base and the same al-titude : the pyramid will beequal to a third of the prism. Cut off the pyramid F—ABC…
Geometry · Plane trigonometry
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