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^{2}+ (1/12)ML

^{2}and that for a disk it's the same. Other people have told me that it's I = (1/2)MR

^{2}for a disk and that it's the same for a cylinder. In the past I've used the former and have gotten the right answers on my homework but I used the same equation for a question i'm stuck on and got the incorrect answer. I just want some clarification on this, I'd really appreciate it.