So how would we do that? Well, so to find the volume of the outer shape, so let me draw it over here. So actually, let me just draw it over here. If we think about the volume of the outer shape, once again, we can use the disk method. So at any given point in time, our radius for one of our disks is going to be equal to the function. Let's rotate that disk around. Actually, let me do it in a different color.