From center of square inscribe a 4" and 7" circle. By placing points in the right and left sides of smaller circle, divide the circumference into two equal parts, and from these points construct a hexagon in the circle. Number the left corner 1, the back left 2, back right 3, right 4, front right 5 and front left 6. Join, with the ruler, points 1 and 3, and draw lines from these points to the circumference of larger circle. Draw corresponding lines from points 2 and 4, 3 and 5, 4 and (3, 5 and 1, 6 and 2. From the model cut, fold, and sew.