1. The problem statement, all variables and given/known data Consider 3 objects of equal masses but different shapes: a solid disk (radius R), a thin ring (radius R), and a thin hollow square (side 2R). The ring and the square are hollow and their perimeters carry all the mass, but the disk is solid and has uniform mass density over its whole area. Compare the three objects' moments of inertia when rotated around their respective centers of mass. Rank their moments of inertia from greatest to least. 2. Relevant equations I know that for the disk, I = 1/2MR^2, and for the ring, MR^2. 3. The attempt at a solution I don't know about the hollow square...can someone please give a hint? Thanks!