Well, it's going to be equal to dx, and let's rotate that whole thing around the x-axis. So if we rotate this thing around the x-axis, we end up with a washer. That's why we're gonna call this the washer method. It's really just kind of the disk method where you're gutting out the inside of a disk. So that's the inside of our washer, and then this is the outside of our washer. Outside of our washer looks something like that. Hopefully that makes sense.