Question

A cylindrical piece of iron pipe is shown below. The wall of the pipe is 0.75 inch thick, and the pipe is open at both ends:

The figure shows a cylinder of height 16 inches and diameter 6 inches.

What is the approximate inside volume of the pipe? (6 points)

113 cubic inches
452 cubic inches
410 cubic inches
254 cubic inches

Answer 1

We can check our answer with some quick calcs.
The wall is 0.75 thick, so we can subtract 0.75 from the radius of our cylinder. The radius is half the diameter, 6/2 = 3; 3-0.75 = 2.25
Now for the volume of the inner cylinder: pi*(2.25^2)*16...
The answer would actually be about 254