The normal elementary geometry : embracing a brief treatise on mensuration and trigonometry : designed for academies, seminaries, high schools, normal schools, and advanced classes in common schools (1884)
Brooks, Edward, 1831-1912 · Philadelphia : Christopher Sower Co. · leaf 153
ight. For, inscribe within the frustum ofa cone the frustum of a right pyramid.The convex surface of this frustum isequal to one-half the sum of the peri-meters of its bases multiplied by the slant height (B. YLTh. XIX.); and this is true whatever the number of lateralfaces; hence, it is true when… … BOOK VII. 149 frustum of the cone, and the slant height of the frustumof a pyramid becomes the slant height of the frustum of acone; hence, the convex surface of the frustum of a coneequals one-half the sum of the circumferences of its basesmultiplied by the slant height.- „ Gor. The expression for…
Geometry · Plane trigonometry
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