Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 254
Y. 253 Mensuration of the Round Bodies PROBLEM V. To Jind the surface of the frustum of a cone RULE. Add together the circumferences of the twe bases; and multi-ply the sum by half the slant height of the frustum; the productwill be the convex surface, to which add the areas of the bases-when the… … half side Operation.8.4614~46.25 We merely take the sum of the circumferences of the bases, and multiply by half the slant height, or side. area = 90 sq. ft. 2. What is the entire surface of the frustum of a cone, theside being 16 feet, and the radii of the bases 2 and 3 feet ? Ans. 292.1688 sq.ft.…
Geometry · Plane trigonometry
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