answer is 2 kg m^2

take the axis about which moment of inertia is to be found as one of the perpendicular axis and one axus perpndicular to it as another axis and treat them as the perpendicular axis and then apply perpendiculat axis theorem.another way of thinking is that the moment of inertia is dependant only on mass and distribution of mass about the axis which here is same for the axis along the centre in the plane of the ting and about the axis about which moment of inertia is to be found.................