1. The problem statement, all variables and given/known data I'm trying to work out the moment of inertia for this L shaped beam: http://dl.dropbox.com/u/630750/Screen%20Shot%202011-12-31%20at%2017.54.34.png [Broken] 2. Relevant equations (Included on my sheets below( 3. The attempt at a solution I've made two attempts, the first one I think I did wrong as I didn't take into account that Rectangle A wasn't rotating around it's center? Attempt 1: http://dl.dropbox.com/u/630750/Sheet1%202.jpeg [Broken] Attempt 2 I tried to correct that but Ix and Iy have came out pretty much the same, so that can't be correct, can it? Attempt 2: http://dl.dropbox.com/u/630750/Sheet1%203.jpeg [Broken] Thanks for your help. Also, how would I work out Ixy from this?