Ok, what is "quilters magic number" all about? I was looking online for how to figure my corner triangle and side triangles for my quilt that I am setting up on-point. I came across "Stitch This"
"http://blog.shopmartingale.com/quilting-sewing/how-to-calculate-setting-triangles/ This blog tells step by step with pics and in plain english how to do this. Now I can get on to cutting up my fabric and get my quilt top completed..
Hope this is as helpful to you as it was to me.