Answer
a. $804\ m^2.$
b. $2140\ m^3.$
Work Step by Step
a. The area of the sphere is
$A=4\pi r^2=4 \pi (8)^2=804.3\ m^2\approx 804~m^2.$
b. The volume of the sphere is
$V=\frac{4}{3}\pi r^3=\frac{4}{3} \pi (8)^3= 2144.66\ m^3 \approx 2140\ m^3.$
