Angelia, I don't do geese like this anymore but teach it this way because not everyone has a ruler for it, or don't like to use it. I bought one at Joann with a 40% coupon, it was under $10. I know you end up with bias, but it is so easy for me to do and much more accurante for me. And when you are sewing the blocks together, 99% of the time you are sewing to a straight grain block. I was always not making the block right, or it got cut a tiny bit off because of my astigmatism. Anyway,I know there are a couple different ones out there, this was omnigrid, and I love it.