Now, that's the, actually let me be clear. That's the area, the volume, the volume of one of those shells is going to be equal to, and I'll just write this in one color. It's going to be pi over two times one minus x over two squared times the depth, the area times the depth. So this is volume of one of these half discs. Half discs. So the volume of the whole thing we can approximate as the sum of these, or we could take the limit as our delta x's get much, much, much, much smaller, and we have an infinite number of these things, which is essentially, if we're taking that limit, we're gonna take the definite integral. 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.