Hi, I would like some clarification on the following. Suppose I have a unit square A, symmetric about the xy plane. In addition to this, suppose that I cut a square B from A so that I am left with a lamina (A - B). Where B is a (1/4) * (1/4) square which is symmetric about the x-axis and lies in the half plane x >=0 with one of its sides along the y-axis. If I know the centre of gravity of A and the centre of gravity of B, is it possible for me to find the COG of (A - G)? Any help would be good thanks.