So we want to write, we want to essentially define the volume of the figure, and we're kind of in the home stretch here. Actually, let me write it right. This is volume of a section, volume of a cross section. So what's the volume of the entire thing going to be? Well, the volume of the figure is going to be the definite integral from x equals 0 to x equals c of 1 fourth h squared. 1 fourth, but we know that h is equal to f of x minus g of x. So instead of h, I'm going to write f of x minus g of x squared dx.