Math problem Volume of Cylinder

Question

What are the answers the follwing questions;

1.The radius of a cylindrical construction pipe is 3.5ft If the pipe is 40ft long, what is its volume?

2.The radius of a cylindrical water tank is 4ft and its height is 11ft What is the volume of the tank?

3.The diameter of a cylindrical water tank is 12ft and its height is 15ft What is the volume of the tank?

also Use the value 3.14 for π and round the answer to the nearest whole number.

Answer 1

Volume = hpir^2 = 40pi(3.5)^2 = 40(12.25)pi = 490pi ft^3 = about 1539.4 ft^3

V= 4pi11^2 = 4(121)pi = 484pi ft^3 = about 1520.5 ft^3

V=15pi(12/2)^2 = 15(36)pi = 54pi ft^3 = about 169.6 ft^3