And then this third rectangle, what's its height? Well, we're gonna take the height at the midpoint. So 3 1 2 squared is 9 4ths plus one, which is the same thing as 13 4ths. So it has a height of 13 4ths, and then a width of one, so times one, would just give us 13 4ths. So plus 13 4ths, which would give us 23 over four, which is the same thing as 5 3 4ths. And so this is often known as a midpoint approximation, where we're using the midpoint of each interval to define the height of our rectangle. But this isn't the only way to do it.