1. How many cans must be bought to paint the curved face with one coat?
2. h = 15.5 meters, d = 4.2 meters, 1 can = 10 sq. meters
3. curved face = 2πrh
4. curved face = 2π(2.1)(15.5) = 204.518 sq. meters
5. 21 cans must be bought to paint the curved face with one coat.
