There's a symmetry here. There is a symmetry here. And so you add them all together, and you get our integral is going to be equal to four. And once again, just as a reality check, you could say, look, the height here is two, the width, the base here is two. Two times two times 1 1⁄2 is indeed equal to two. Same thing over here. So that's the more geometric argument for why that area is two, that area is two.