I've sent along precut white squares. The 4.5 is your center and then you have two 9.5 inch squares per block. You will need to cut these in half diagonally to make 4 triangles.
piece together as shown above-make sure you pin those buggars.
Then trim 1 and 1/4 inch all the way around
Blocks should be slightly over 15.5 inches square.Thank you in advanced for doing these for me. Any questions, just drop me an email.