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x=∫∫xμ(x，y，z)dσ/∫∫μ(x，y，z)dσ

Where μ(x, y, z) is the density of the object and μ(x, y, z)dσ is the mass element of the object.

Y=∫∫yμ(x，y)dσ/∫∫μ(x，y，z)dσ

Z=∫∫zμ(x，y，z)dσ/∫∫μ(x，y，z)dσ

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