1. The problem statement, all variables and given/known data Find the moment of Inertia of a cube (mass M, length L) around an axis going through one of the edges. 2. Relevant equations I=Ʃmr2 3. The attempt at a solution Well I imagined the cube is formed of infinitely many square plates. The width of the square plate is dL. ρ=M/L3 dm=ρ*L2*dL so now im stuck with the integral what is r? is r = L√2/2 from pythagorean thm ?