Elements of geometry : containing the first six books of Euclid, with a supplement on the quadrature of the circle, and the geometry of solids : to which are added, Elements of plane and spherical geometry (1826)
Playfair, John, 1748-1819, Euclid · Philadelphia : Marot & Walter · leaf 206
C. But the pyramidof which the base is the triangle ABE, andvertex the point C, that is, the pyramid ABCEis equal to the pyramid DEFC (14. 3. Sup.),for they liaye equal bases, viz. the trianglesABC, DEF, and the same altitude^ viz. thealtitude of the prism ABCDEF. Thereforethe three pyramids ADEC,… … 206 SUPPLEMENT TO THE ELEMENTS Cob. 1. From this it is manifest, tlsat eveir pyramid is the thirflpart of a prism wliich has (In- same liase, and the same allitude withit; for if thi base of the prism be au_\ other figure than a triangle,itmay he divided into prisms havina triangular bases. Cor. 2.…
Euclid's Elements · Geometry · Trigonometry
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