I THINK this will work. Cut a rectangle 3 7/8 x 4 7/8 out of each of the two fabrics. Stack them BOTH right sides up. Cut from corner to corner IN THE DIRECTION you want the triangles. Match each triangle with the opposite triangle of the other color. They should look just like you want them to when they are finished. Carefully sew the bias edges together being sure to have your little rabbit ears(about 3/8 inch) showing on either end. Some would suggest starching the rectangles before cutting to reduce the bias stretching. Good luck. Ann