So the width of each of these, the width of each of these, is going to be two pi minus pi. So I'm just taking the difference between my bounds of integration, and I am dividing by n, which is equal to pi over n. So that's the width of each of these, that's pi over n. This is pi over n, this is pi over n. And what's the height of each of these rectangles? And remember, this is a right Riemann sum, so it's going to be the right end of our rectangle is going to define the height. So this right over here, what would this height be? Well, this height, this value, I should say, this is going to be equal to f of what? Well, this was pi, and this is going to be pi plus the length of our interval right over here, the base of the rectangle. So we started at pi, so it's going to be pi plus, this one's going to be pi over n, I could say, times one.