So if that's our Y axis, and then this is our X axis right over here. And I can redraw region R. It looks something like this. And now let's just imagine a cross section of our solid. So it says the cross section of the solid taken perpendicular to the Y axis. So let's pick a Y value right over here. We're gonna go perpendicular to the Y axis. It says whose base lies in R. So the base would look like that.