area formula
 Area is a quantity expressing the twodimensional size of a defined part of a surface, typically a region bounded by a closed curve. The surface area of a 3dimensional solid is the total area of the exposed surface, such as the sum of the areas of the exposed sides of a polyhedron.
octagon
 A plane figure with eight straight sides and eight angles
 In geometry, an octagon (from the Greek okto, eight) is a polygon that has eight sides. A regular octagon is represented by the Schlafli symbol {8}.
 Octagon (Real name unknown, born March 27, 1961) is a Mexican Luchador Enmascarado (Masked Professional Wrestler) currently with Asistencia Asesoria y Administracion (AAA), having worked for the company since it was founded in 1992.
 An object or building with a plan or cross section of this shape
 an eightsided polygon
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derivation of deflection formulas
deflection formulas (derived using areamoment theorems)
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