I'm doing a physical pendulum problem involving a rigid rod of .720m in length attached to a string of 1.00 meters in length. I'm supposed to find its period. I can do the problem but I'm having trouble calculating the rods moment of inertia. Parrallel Axis Theorem: I = Icm + MD^2 Icm = I (1 + .720) ^2, Is md^2 the same thing...? I'm a little confused on this point.