Originally Posted by Randa
Originally Posted by magpie
How large is your cutting mat? Use the lines on it.
And do I just pick any edge as my straight edge and cut anything outside the 20 1/2" square?
you will probably need to take a little off all the edges. you need to find a way to press or chalk mark the diagonal. then use that line, not the edge of the block. or you can use a straight seam line & measure from that all directions. man, the more I type, the more complicated I am making it. start with the smallest block & make them all that size, unless you will lose points. you may need to make another block or two to get enough sized ones.
guess I would measure 10 1/4" from the center to each edge. you would be working in quandrants. that way, you could use a smaller (12 1/2 ") square ruler. this is probably the biggest block you will ever need to square !