??? sizes for square in a square in a square
I'm sure this has been addressed many times, but I did not need it until now and do not know how to find the answer on the previous boards. I am making a storm at sea and need to know how to figure the sizes for a square in a square in a square for the center block and a square in a square for the corner. The final block is 12 inches, but the center is 8" with 1/2 inch seam allowance and the corner is a 4 " square adding 1/2 inch for seams. If this is something someone could help me find, it would be appreciated. Thanks.