Help! I have changed a straight setting to an on-point setting with my blocks. Now I need to configure the corner and side triangles to fill in with my background fabric. My LQS gave me a formula to use that is rather convaluted. It works, kind of, but the pieces are small on the corners and big on the sides. Does anyone out there have a simple formula for figuring these pieces? My quilt is small so I can easily rip out what I have sewn in and try again. My finished block size is 9". I've looked in all my books and can't seem to find the formula I need.