Let Ι be the moment of inertia of a uniform square plate about an axis AB that passes through its centre and is parallel to two of its sides. CD is a line in the plane of the plate that passes through the centre of the plate and makes an angle θ with AB as shown in figure. The moment of inertia of the plate about the axis CD is then equal to 
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A
By perpendicular axis theorem moment of inertia about any axis passing through centre and in the plane of plate will be Ι (by symmetry)
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