Yeah, that was pretty uncool. You can either find the angle, or you can measure in from the edge. This will look wonderful however you do it, just as long as the blocks are consistent. Of course, it would even be cool with inconsistent blocks if they are obviously inconsistent, giving you another type of modern look. That's what I love about quilting -- you can do whatever is pleasing to your eye and you get a beautiful quilt (or pillow top)!