So in reading Detailed Discussion on Knife Sharpening Angles, which I can't speak to the accuracy of, it seems that these folks are calling what I always thought of as a 20 degree angle 40 degrees. This led me to wonder whether the angles on the razors and knives I use are something altogether different. For instance, my fillet knife and my razors are around 17 degrees, according to my sharpener for my knife (a Lansky) and what I've read about my razors. I wonder if this means that one or both of these is the angle of both sides of the bevel or just from the center point of the blade to one side of the bevel.

Any ideas?