Haswell, Charles Haynes, 1809- [from old catalog] · New York, Harper & brothers · leaf 265
Example.—The back of a wedge, abed, Fig. 32, is 50 by2 inches, and its end, ef, 20 by 2 inches; what is its surface ? 202 _j_ 2-M = 401 = sum of the squares of half the base, afand the height, ef, of the triangle, ef a. -^401 — 20.025 — square root of above sum — length ofea.Then 20.025x20X2 = 808… … pute tlie Surface of a Prism oi&—Fig. 33.Rule.—Ascertain the area of the ends and sides asby the rules for squares, triangles, etc., and add themtogether. tf Example.—The ends of a prismoid, efg h and abed, Fig. 33,are 10 and 8 inches square, and its slant height 25; what is itssurface ? 10x10…
Engineering · Mechanical engineering
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