Originally Posted by GrannieAnnie
If she's using a 9" (finished) 9 patch, and the alternating block is going to be a snowball, then the snowball needs to be cut at 9 1/2 for seam allowance and each square for a corner needs to be cut at 3 1/2" to match the finished little squares in the 9 patch block
OR MAYBE I DIDN'T UNDERSTAND THE QUESTION
There is no rule that says it has to be 3.5". Traditionally it is done that way. But so what? Why do they have to match?
Look at the diagrams I provided upthread.
And you don't have to shout.