I found another lot of instructions here that give the correct formula. Well, I just got through it but on two, I had a bit of trimming to do. What did I learn? well, apparently my sewing 1/4" from a line can be a little challenging for me. I might practice that because I think it's a good method. If you have any tips, feel free to share.
They don't look too bad so I did get away with it. Hopefully, I can get back to the machine soon, the Baltimore applique block is nearly done after a week of sewing on it.