The book Elements of Solid Geometry was written by author W H William Herschel Bruce Here you can read free online of Elements of Solid Geometry book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Elements of Solid Geometry a good or bad book?
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The lateral faces of a frustum of a regular pyramid are congruent isosceles trape- zoids and its slant height is the altitude of any lateral face. 645. The lateral edges of a regular pyramid are equal, and the lateral faces of a regular pyramid are equal. PROPOSITION XIII. THEOREM. 646. The lateral area of a regular pyramid is equal to half the product of the slant height by the perimeter of the base. Given A-BCDEF, a regular pyramid, L its slant height, P the perimeter of its base, and S its l...ateral area. To prove S = \ L x P. Proof. The lateral faces ABC, ACD, etc. , are equal isos- celes A. 645 The common slant height L is the altitude of each A. . '. The area of each lateral face is = \L x its base. 425 . '. The sum of all the lateral faces =\ L X sum of bases. But the sum of the bases = P. Q E. D POLYHEDRONS. 49 647. COR. The lateral area of the frus- tum of a regular pyramid is equal to half the product of the slant height multiplied by the sum of the perimeters of its bases. If P is the perimeter of its lower base and p is the perimeter of its upper base, then S = % (P+P)L.
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