![]() This holds true for all regular polygons. The result is valid for both a horizontal and a vertical axis through the centroid, and therefore is also valid for an axis with arbitrary direction that passes through the origin. It The plastic section modulus for a rectangular cross section can be determined by multiplying each section half (e.I y = ∬ A x 2 d x d y. The second moment of area for the entire shape is the sum of the second moment of areas of all of its parts about a common axis.
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