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Old Dec 2nd 2008, 05:46 PM   #1
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Triangular Prism and moment of inertia

A triangular prism, of mass M, whose two ends are equilateral triangles parallel to the xy plane with side 2a, is centered on the origin with its axis algon the x axis. Find it moment of inertia for the rotation about the z axis.

ok, so what i have done so far is draw a picture, and find the coordinates. But i got confused because i didn't know how to take in the fact that the side is 2a. I have the equation of I_zz=Sum[M(x^2+y^2)]. But I didn't know what to use for x and y. any help would be great.
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