Had no trouble fitting the round piece into the square. It's 2 pieces and the pattern for it comes with the pattern. That's part of the perfect 1/4" seams that comes into the pattern fitting together so easy. And that is what also gave me the perfect points. An easy fun pattern. Just go to Phillipps site and see how easy it is. I have a couple of their other patterns I am going to do. I love their patterns. It' a challenge to me to be able to do them.