So we could take the definite integral, so the volume that we care about, the volume of this figure is going to be equal to the definite integral from x equals zero to x equals one. That's where we intersect the x-axis. X equals zero to x equals one of, we're integrating an infinite number of these things that are infinitely, I guess, thin. So it's going to be, let me write it. It's gonna be pi over two times, I'll just write it, what's one minus x squared? Let me just expand it out for fun right over here. So that's going to be, that's the same thing as x minus one squared, so it's gonna be x squared minus two x plus one, and then two squared is four, over four, and instead of delta x, I'm gonna write dx now.