We are finding the mean. 6+6+9+10+11 / 5 = 8.4
surface area = 4*pi*r^2
using 3.14 for pi
452.39 = 4*3.14*r^2=
452.39=12.56* r^2
r^2 = 452.39/12.56 = 36.0
sqrt(36) = 6= r
diameter = 2r = 6*2= 12
diameter = 12 feet
Tee answer would be 369,600, because 5,280 x 70 = 369,600
