The Attempt at a Solution
I know some of you may have given up on me understanding moment of inertia/second moment of area, but here is another problem. I am using the this table to get the equations for the polar moment of area of a hemicircle around the x-axis, then I am applying the parallel axis theorem to find the polar moment of inertia. The answer in the back of the book doesn't even have the term a in it, which is what I don't get.
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