A metal conduit will be used as a pathway for wiring through a concrete block. The conduit is a 5 foot long rod with an outer diameter of 3 inches and an inner diameter of 2.8 inches. What is the volume of metal in the conduit in cubic centimeters? Can someone help me set this problem up with a formula, please?

Question

A metal conduit will be used as a pathway for wiring through a concrete block. The conduit is a 5 foot long rod with an outer diameter of 3 inches and an inner diameter of 2.8 inches. What is the volume of metal in the conduit in cubic centimeters?  Can someone help me set this problem up with a formula, please?

anonymous · Answer

Thank you.  Do you mind telling me the steps you used to get this answer?

anonymous · Answer

Calculation formula for Volume is
$$V = \pi×h×(R² − r²) $$
$$V= \pi × h ×\frac{ (D² − d²) }{ 4 } $$
Here, h = 5, D = 3, d = 2.8
Substitute these values in above equation to find V.