And then this distance between that point and this point is the same as the distance between f of x and g of x for this x value right over there. And obviously that changes as we change our x value. And to help us visualize the shape here, I've kind of drawn a picture of our coordinate plane. If we view it as an angle, if we're kind of above it, you can kind of start to see how this figure would look. Once again, I've drawn the base of it. I've drawn the base of it right over there. Maybe I should, to make it clear, let me make it like this.