On the flat surface of a disc of radius `a`a small circular hole of radius b is made with its centre at a distance c from the centre of the disc. If mass of the whole un cut disc is M, calculate the moment of inertia of the holed disc about the axis of the circular hole.
`[(1)/(2)[a^(2) + 2c^(2)- (b^(4))/(a^(2))]]`