Elements of geometry and trigonometry. Revised and adapted to the course of mathematical instruction in the United States (1856)
Legendre, A. M. (Adrien Marie), 1752-1833, Davies, Charles, 1798-1876 · New York : A.S. Barnes · leaf 203
198 GEOMETRY. … Let FGTI-h be the frustum of atriangilar ])yrainid. Through thethree points, t\ y, //, pass the planeFqII\ it cuts oir from the frustumthe triaiiguhir pyramid g-FGlI. Thispyramid has for its base the lowerbase FGII of the frustum ; its alti-tude is equal to that of the frus-tum, because the vertex…
Geometry · Trigonometry
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