He could be thinking of 5,637 people at the game
3 consecutive odd integers....x, x + 2, and x + 4
x + x + 4 = 3(x + 2) - 131
2x + 4 = 3x + 6 - 131
2x + 4 = 3x - 125
2x - 3x = - 125 - 4
-x = - 129
x = 129
x + 2 = 129 + 2 = 131
x + 4 = 129 + 4 = 133
so ur 3 odd numbers are : 129,131, and 133 <==
the radius: r^2 = 81
r =9
c = 2*pi*r
= 2 * pi * 9
= 18 *pi
Answer: 18*pi or approximately 56.62