r square here and then this 2 and here 4 half mass r square; half m r square that is the moment of inertia of this disc about the axis passing through the centre of the ring and it is a perpendicular to the plane of this ring
डिस्कच्या केंद्रबिंदू मधून जाणाऱ्या लंब अक्षाभोवती मोमेंट ऑफ इनर्शिया इतका मिळेल.