Help to square up a square
I tried uploading a pic of the square but it keeps failing.It is only 1.43 mb in jpg format so not too large. Regardless, I am making a double pinwheel block, it has 4 squares of one large triangle with 2 smaller ones sewn to the long side of larger triangle. These squares need to be trimmed to size and squared and I am having a hard time getting them right without compromising the design created when all sewn into the block. I believe the square has a "y" seam if that helps to define it. Does anyone know what I'm trying to do? Thank you in advance!