And one way to think about it is, well, let's just think about each of these. Let's split up the figure into a bunch of disks. Into a bunch of disks. If you figure out the volume of each of those disks, if you figure out the volume of each of those disks and sum them up, then that would be a pretty good approximation for the volume of the whole thing. And then if you took the limit as you get an infinite number of disks that are infinitely thin, then you're going to get the exact volume. So let's just say, let's just take the approximating case first. So let's say that right over here at x, what is going to be, what is going to be the diameter, what is going to be the diameter of the disk at x?