We're just saying at the point c. So we really, when we're thinking about area, we're thinking about a, we're thinking about things, we're thinking about how much two-dimensional space you're taking up. But this idea, this is just a one-dimensional, this is just a one-dimensional, I guess you could think of it as a line segment. What's the area of a line segment? Well, a line segment has no area. So this thing right over here is going to be equal to zero. Now, you might say, okay, I get that. I see why that could make sense, why that makes intuitive sense.