So this section over here, we did this in part a actually, this is a quarter circle, so it's 1 fourth, so these are both quarter circles, so we could multiply 1 fourth times the area of this circle, the area of this circle, of this entire circle, if we were to draw the entire thing all the way around, it has a radius of 3, so the area of the entire circle would be pi times 3 squared, or it would be 9 pi. And of course we're going to divide it by 4, multiply it by 1 fourth to just get this quarter circle right over there. And then this area right over here, the area of the entire circle, the area of this entire circle, we have a radius of 1, so it's going to be pi times 1 squared, so it's going to be pi, and we're going to divide it by 4, we're going to divide it by 4 because it's only 1 fourth of that circle. And we're going to subtract that, so we have negative pi, and we're multiplying it times 1 fourth out here, because it's a quarter circle in either case, and we're subtracting it because the area is below the x axis. And so this simplifies to, this is equal to 1 fourth times 8 pi, which is the same thing as 2 pi. Did I do that right? 1 fourth times 8 pi, so this all simplifies to 2 pi.