They make cmu block with that is "bent" at a 135 degree angle. It has two cells like a standard rectangular block. I was looking for a design example with an angled wall or pier that would assist in calculating the properties and strength of one of these cmu walls.
Mechanics of materials will do it for you, and probably strain compatibility. I wouldn't try to get it too close though. You know, measure with a micrometer, mark with a crayon and cut with an axe.
I don't believe structural engineers usually account for the "accurate" properties of these special blocks as masonry design is not an exact science. Besides, in the end, calculated stresses on the walls/piers are far less than the allowable.
