Sample problem 7-4 Fig 7-13 shows a Fig 7-13 circular metal plate of radius 2r from Which a disk of radiusr has been emoved. find the cm(xof the plateSample problem 7-4 Fig 7-13 shows a circular metal plate of radius 2R from which a disk of radius R has been removed. Find the cm (x) of the plate. Fig 7-13 x y D C x R