She has a formula to use for all sizes. Here is a sample. For the 3 in by 6 inch geese. Take the 6 in and add 1 1/2 in for the points square then add another 1 1/2 in for the larger backgrd square. Your points are a 7 1/2 in square and the background is a 9 inch square. It makes 4 geese.
This formula is for all sizes. Just use the length of the goose you want and add 1 1/2 in. You dont have to use her rulers but you do need to know how to sew the squares.
To see her video go to the
http://quiltinaday.com
and click on the television and video button.