Question

A cylindrical piece of iron pipe is shown below. The wall of the pipe is 1.25 inches thick.
What is the approximate inside volume of the pipe?

69 cubic inches
99 cubic inches
332 cubic inches
703 cubic inches

Answer 1

do we know what the height and radius are?

Answer 2

oh ya sorry height is 14 inches and diameter is 8

Answer 3

does the diameter given include the thickness of the cylinder?

Answer 4

lol I really don't know since that's all the question says XD, but I know its either 332 or 703

Answer 5

well you know the equation right?

Answer 6

ya I think we have to find the area of the circle then multiply it by the height

Answer 7

or the volume of a cylinder formula?

Answer 8

yes
\[\pi \times r ^{2}\times h\]

Answer 9

thats the equation for the V of a cylinder

Answer 10

so we don't have to use the thickness? sorry im a bit confused with this chapter XD

Answer 11

ok so its 3.14*4^2*14?

Answer 12

well lets just assume that the diameter includes the thickness... we need to subtract the thickness twice to compensate for both sides
the equation should be
\[\pi \times (\frac{ 10- 2 \times 1.25 }{ 2 })^{2} \times 14\]

Answer 13

sorry give me a sec to solve lol

Answer 14

i think your choices are off