1. The problem statement, all variables and given/known data the theory behind Parallel axis theorem 2. Relevant equations parallel axis theorem:Io=Ig+md² Radius of Gyration=Ig=m*K² 3. The attempt at a solution ok folks If I understand this theory correctly the radius of gyration is the radius or distance from the axis of rotation to the center of the AREA the parallel axis then takes this area into account and converts the equation to account for the area and the mass. I am trying to teach myself dynamics before I pay for another course at college and bomb out because the professors dont explain anything... is this a correct understanding? if not can you help me?