An electronics company used a pipe that was 100 ft long and had a radius of 10 ft. Inside the pipe was a smaller cylindrical tube, for wires, that had a radius of 2 ft and was as long as the pipe. The remaining space in the pipe, outside the tube, was filled with liquid foam.

What was the volume of the foam inside the pipe? Use 3.14 to approximate pi.

______ft3

Question

An electronics company used a pipe that was 100 ft long and had a radius of 10 ft. Inside the pipe was a smaller cylindrical tube, for wires, that had a radius of 2 ft and was as long as the pipe. The remaining space in the pipe, outside the tube, was filled with liquid foam.
 
What was the volume of the foam inside the pipe? Use 3.14 to approximate pi.
 
  ______ft3

radar · Answer

Man that is some big conduit lol.  First calculate the volume of the larger pipe.
Next calculate the volume of the inner smaller pipe.
Then, subtract the smaller volume from the larger and that will be the volume of foam.

radar · Answer

You might find it easier to just take the area of the smaller circle (pipe) from the area of the larger circle (pipe) and multiply the results by 100.