Answer
a. $1330\ ft^2.$
b. $4580\ ft^3.$
Work Step by Step
a. The area of the sphere is
$A=4\pi r^2=4 \pi (20.6/2)^2=1333.166\ ft^2\approx 1330\ ft^2.$
b. The volume of the sphere is
$V=\frac{4}{3}\pi r^3=\frac{4}{3} \pi (20.6/2)^3= 4577.20\ ft^3 \approx 4580\ ft^3.$
