Answer:
4200π ft² ≈ 13195 ft²
Explanation:
You want the surface area of a cylinder 30 feet in radius and 40 feet high.
Area formula
The formula for the area of a cylinder adds the area of the two circular bases to the lateral area:
A = 2πr² +2πrh = 2πr(r+h)
Application
For the given dimensions, r=30, h=40, the area is ...
A = 2π(30 ft)(30 ft +40 ft) = 4200π ft² ≈ 13195 ft²