The diameter of a construction pipe is 4ft . If the pipe is 19ft long, what is its volume?
(Use the value 3.14 for Pi , and round your answer to the nearest cubic foot. Be sure to include the correct unit in your answer.)

Question

The diameter of a construction pipe is 4ft  . If the pipe is 19ft long, what is its volume? 
(Use the value 3.14 for Pi  , and round your answer to the nearest cubic foot. Be sure to include the correct unit in your answer.)

anonymous · Answer

Assuming the pipe has a cylindrical shape, the formula for its volume is described by$$V=\pi r^2 h.$$Since you're given its diameter, its radius is then$$r=2.$$Plugging all the values given into the above formula yields$$V=\pi (2)^2(19)=76\pi.$$Substitute 3.14 for π and round as required. If you need any help doing this, ask.