Step 2: Marking

Picture of Marking
Screen Shot 2012-01-19 at 12.55.32 PM.png
First Find the center.  Since my squares are about 13" x 13" -  I measured 6.5" from two adjacent edges.  I used a trammel/compass from The Home Depot to mark the radius.  Since these squares are the same diameter as the desired circles, I place the point in the center and extend the arm to the middle of one edge to define the radius.