Well, at least you're way ahead of the game for the next one
Earlier this week, I could not for the life of me, figure out which half square triangles die I needed if the pattern called for making two from a 4" square. Talk about a DUH moment when I asked on an Accuquilt FB page and was told 3.5" finished half square triangle.
We've all been there . . .live and learn and then go play