A solid circular disk consists of a mass of 1.2 kg and a radius of .17m. Each of the three identical thin rods consists of a mass of .15kg. The rods are joined perpendicularly to the plane of the disk at its outer edge to form a three-legged stool. Determine the moment of inertia of the stool with respect to the axis which is perpendicular to the plane of the disk at its center.