I know there are many methods of piecing HSTs. That isn't my question. I have a slightly different problem and maybe someone out there knows the answer, or how to find it.
I want to piece a large number of the block below, and I would prefer to do it somewhat efficiently and precisely. The lower triangle is 3" on each side, the upper triangle is 6" on each side, and the middle strip is 3" on the finished side of the block, but the strip width would be 4.2426... call it 4.25, finished. The block finishes at 6" square.
I'm afraid the easiest way may be to make HST's with the top and middle fabric, then add the bottom fabric and just trim to size. But I have a suspicion there may be a really clever way to do this, and I'd hate to find it out AFTER I make them another way.
BTW, I don't want to have any seams in addition to the two already in the block, otherwise I could divide it up into 3HST's and a square.