I don't even bother looking at the measurements they are supposed to be anymore. One of the best books I own is triangle free quilts. The reason being is she has you cut for your blocks out those together and then has you remeasure to see what size blocks you have then cut for the next part and so on. I hardly ever match up with the perfectness of the pros and your looking at a picture there is no proof even there sample was perfect to the measurements in the pattern. I'm not picky on a particular size though so I always square up my blocks and go from there and all my quilts have turned out so nice and I have always been happy!