Calculation of the Moments of Polygons (PDF) (Technical report). Vector Mechanics for Engineers (10th ed.). Statics and Mechanics of Materials (Second ed.). In engineering practice, however, moment of inertia is used in connection with areas as well as masses. The term second moment is more proper than the term moment of inertia, since, logically, the latter should be used only to denote integrals of mass (see Sec. The second moment of area is typically denoted with either an I. The second moment of area, or second area moment, or quadratic moment of area and also known as the area moment of inertia, is a geometrical property of an area which reflects how its points are distributed with regard to an arbitrary axis. For a list of equations for second moments of area of standard shapes, see List of second moments of area.
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