So the general form of the right boundary is going to be, so for example, this height right over here, this is going to be f of, we started at pi, plus, we're doing the right Riemann sum, so we're gonna add pi over n n times by this point. Pi over n times n. Or, if we wanted to say it generally, if we're talking about the ith rectangle, remember, we're gonna sum them all up, what's their height? Well, the height is going to be, in this case, it's going to be cosine of pi plus, if we're with the ith rectangle, we are going to add pi over n i times. Pi over n times i. And then, that's the height of each of our rectangles. And then what's the width? Well, we already figured that out.