Gore, James Howard, 1856-1939 · New York, Longmans, Green, and co. · leaf 181
168 SOLID GEOMETRY [BK. VII. PROPOSITION I. THEOREM. 415. The lateral area of a prism is equal to the product of theperimeter of a right section by a lateral edge. … B Let AD be a prism, and FGHIK a right section. To prove that the lateral area = AA (FG + OH + HI, etc.). Since a right section is perpendicular to the lateral edges,FG, GH, HI, etc., are altitudes of the parallelograms whichform the faces of the prism. Hence, area of A ABB = AA x FG (by 251),and…
Geometry
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