Grain is stored in cylindrical structures called silos. find the volume of a silo with a diameter of 11.1 feet and a height of 20 feet.

1.) Find the area of the circle at the top ( A= pi x radius squared )
2.) radius is 5.55 (half of 11.1)
3.) A= pi x 5.55 squared
4.) area of circle =96.77
5.) multiply area of circle(96.77) by height (20)
6.) answer = 1935.38

Maybe the answer is 20mm. all i really did was just multiply, which is obvious.