| Definition: | for a plane surface S and a specified axis perpendicular to the plane of the surface, additive scalar quantity equal to the integral , where R is the distance between a surface element with area dA and the axis NOTE 1 The second polar moment of area is sometimes given the wrong name "moment of inertia" but should not to be confused with the quantity "moment of inertia". NOTE 2 The coherent SI unit of second polar moment of area is metre to the power four, m4.
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