Gina, I used the Easy Angle and Companion Angle rulers to make this top - I have been converted to using these rulers
. But whatever ruler you need to make the sizes specified would work.
But take my advice & make sure you sew an accurate 1/4" seam. That was why I tried this pattern. I wanted to see if I could improve my piecing by sewing that perfect 1/4" seam so that everything would go together correctly...without losing points and the various blocks would all be the correct size. It took me a few tries and I used a tool to know how to set up my machine to get the accurate 1/4" seam. It made a huge difference to sew this up.