1. The problem statement, all variables and given/known data http://img35.imageshack.us/img35/6177/uthw404.jpg [Broken] 2. Relevant equations 3. The attempt at a solution I tried finding the center of mass of the square as if there were no hole in it, and then I added the radius of the circle to the x-coordinate of that. It's wrong, and I'm not sure how to approach it.