If you are using the "large simple wedge" template and just want to add pieces to make it a rectangle, you would cut 2rectangles, 4" x height of triangle (9 1/4"). Place the rectangles right sides together. Position the template so that the edge of the fabric is 1/4" past the vertical line on the template, and make a single cut. You should now have 2 pairs of side pieces. Because you need mirrored pairs, you can't cut a set from a single rectangle of fabric with a sngle cut.