Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 132
e cone. The side of the triangle, CB, which remains fixed, is calledthe axis, or altitude of the cone, and the point C, the vertexof the cone. 21. If a cone be cut by a plane par-allel to the base, the section will be acircle. For, while in the revolution ofthe right angled triangle SAC, the lineCA… … 22. If a polygon be inscribedin the base of a cone, and straightlines be drawn from its verticesto the vertex of the cone, the pyra-mid thus formed is said to be in-scribed in the cone. Thus, thepyramid S—ABCD is inscribed inthe cone
Geometry · Plane trigonometry
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