ok you will have to visulies this----drawing pin taped
with point up-- to your sewing machine to the side of the needle+foot[the side away from the body of machine=]--distance away from needle will be half diameter of circle [use an add on table and you can get big circles] place the center of your fabric on the pin+sew feeding the fabric slowly you will be sewing in a circle--you can fuse applique +sew edge down-can create circles with embroidery on fabric---you can sew 2 pieces of fabric R S T an turn this gives perfect circles