So it's 324. So the area here is equal to pi times 324, or we could say 324 pi. So the area of the entire larger circle, the part that I've shaded in yellow, including what's kind of under this orange circle, if you want to view it that way, this area right over here is equal to 324 pi. So the probability that a point that we select from this larger circle is also in the smaller circle is really just a percentage of the larger circle that is the smaller circle. So our probability, I'll just write it like this, the probability that the point also lies in the smaller circle, so all of that stuff I'll put in, the probability of that is going to be equal to the percentage of this larger circle that is the smaller one. So that's going to be, or we could say the fraction of the larger circle's area that is the smaller circle's area. So it's going to be 16 pi over 324 pi.