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@jemoka / Jemoka Knowledge Base / wiki/concepts/second_moment_of_area.md
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--- title: "second moment of area" type: concept related: [Second Moment Of Area] source: https://www.jemoka.com/posts/kbhsecond_moment_of_area/ confidence: high status: active --- The second moment of area is a value which—given an origin—describes how point masses are distributed around that origin. (i.e. a number for how point masses are distributed). It is in units \(m^{4}\). Take, for instance, the following picture: We have defined an origin at \((0,0)\) of the figure above. Furthermore, we have some \(\rho_{i}\) which is the distance from that origin to each of the infinitesimal areas \(\dd{A}\). Then, the second moment of area is defined as: \begin{equation} I = \iint_{R} \rho^{2} \dd{A} \end{equation} This… would make sense.