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I have 3 point masses of 110 kg apiece. All are connected by 3 massless rods to a massless point in the middle. The system will rotate about that point in the middle. The rods are 3.9 m long. They are 120 degrees apart from each other like:

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Kinda. Anyways, when i'm calculating the moment of interia, am I correct in saying saying (110 kg)(3.9 m)(3.9 m)+(110 kg)(3.9 m)(3.9 m)+(110 kg)(3.9 m)(3.9 m)=5019.3 kg m^2? Do I need to worry about the way the weight is distributed? Or is everything ok because the center of mass is at that point? What if it wasn't? I think I'm confusing the two...

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# Homework Help: Moment of Inertia

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