you must put your ruler over the flying geese block and leave at the top where the two triangles were added, the 1/4 seam allowance there. then also use a vertical line on your ruler and place that over that point. then cut to what ever size you are making. 3 1/2 x 6 1/2 , so on.
Eleanor burns of Quilt in a Day has rulers for trimming FG blks also.
http://www.quiltbug.com/notions/quilt-in-a-day.htm