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A 2-D planar closed surface $L$ which has a mass $M$ and a surface density $\sigma(x,y)$ (in units of mass per areas squared) such that

M=\int_L \sigma(x,y)\,dx\,dy.

The Center of Mass of a lamina is called its Centroid.

See also Centroid (Geometric), Cross-Section, Solid

© 1996-9 Eric W. Weisstein