http://www.math24.net/physical-applications-of-triple-integrals.html(adsbygoogle = window.adsbygoogle || []).push({});

"The static moments of the solid about the coordinate planes Oxy, Oyz, Oxz are given by the formulas"

What exactly does that mean? I understand what a moment about an axis is, but about a plane? what? Do they mean moment about two axis at the same time, or something?

And how did they arrive at the following formulas? http://www.math24.net/images/7tri2.gif [Broken]

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# Mass moment of solids

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