So the whole reason why I've set this up and we're attempting to visualize this figure is I want to see if you can come up with a definite integral that describes the volume of this figure that kind of almost looks like a football if you cut it in half or a rugby ball, but it's skewed a little bit as well. But what's an expression, a definite integral that expresses the volume of this? And I encourage you to use the fact that it intersects at the point, these functions intersect at the point 0, 0 and c, d. So can you come up with some expression, a definite integral in terms of zeros and c's and d's and f's and g's that describe the volume of this figure? So I'm assuming you've paused the video and had a go at it, so let's think about it. So if we want to find the volume, one way to think about it is we could take, we could take the volume of, we could approximate the volume as the volume of these individual triangles. So that would be the area of each of these triangles times some very small depth, some very small depth, so let me just shade it in to show the depth, some very small depth, which we could call, we could call dx. So once again, we could find the volume of each of these by finding the area, the cross-sectional area there, and then multiplying that times a little bit, a little dx, a little dx, which would give us 3, so this is a little dx, which would give us 3-dimensional, that's our dx, I could write that a little bit neater, dx to give us a little bit of 3-dimensional depth.