This is not a 12-1/2" this is not a 9-1/2" but it is a 6-1/2"
Yes, I did use Rhonda's method. BUT I forgot to cut a little big as she did in her tutorial and it was not coming out right. So I scaled down and used a 2-1/2" instead of her 3-1/2" That is why it's so small. This is also my first time of actually sewing triangles and having them come out right.