Hi Jazzy519! The easiest way to make a snowball block that is 9 inches finished is to cut 3.5 inch squares, place the block in the corner and stitch diagonally. Press to see if it is accurate then cut off the extra (only to remove the bulk). Sometimes it is recommended that you stitch a hair width on the outside of the line (towards the inside). That process I always thought was called snowball. It is much easier then trying to sew a cut triangle in the corner. Fons and Porter may have further info on their website. It makes a really nice pattern. GOOD LUCK !!!