Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 141
THEOREM VII. The convex surface of the frustum of a regular pyramid isequal to half the sum of tl/e perimeters of the upper and lowerbases multwlied by the slant height. 140 GEOMETRY. Of the Cone. … Let a—ABCDE be the frustum of aregular pyramid : then will its convexsurface be equal to half the product ofthe perimeter of its two bases multi-plied by the slant height Ff For, since the upper base abcde, issimilar to the lower base ABCDE(Th. iv), and since ABCDE is a regular polygon, it…
Geometry · Plane trigonometry
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