And since it's a washer, we need to subtract out the area of this inner circle. So minus pi times inner radius squared. So we really just have to figure out what the outer and inner radius, or radii, I should say, are. So let's think about it. So our outer radius is going to be equal to what? Well, we can visualize it over here. This is our outer radius, which is also going to be equal to that right over there.