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Reference.org
Planar lamina
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, a planar lamina (or plane lamina) is a figure representing a thin, usually uniform, flat layer of the solid. It serves also as an idealized model of a planar cross section of a solid body in <a href="/facts/Integral/V7lyV997">integration</a>. </p><p>Planar laminas can be used to determine <a href="/facts/Moments_of_inertia/TpLLAVl7">moments of inertia</a>, or <a href="/facts/Center_of_mass/n4Lr9GAz">center of mass</a> of flat figures, as well as an aid in corresponding calculations for 3D bodies. </p>