Sections of steel tube having an inside diameter of 9 inches, are filled with concrete to support the main floor girder in a building. If these posts are 12 feet long and there are 18 of them, how many cubic yards of concrete are required for the job?

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Answer to a math question Sections of steel tube having an inside diameter of 9 inches, are filled with concrete to support the main floor girder in a building. If these posts are 12 feet long and there are 18 of them, how many cubic yards of concrete are required for the job?

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V=18\cdot\frac{\pi}{4}D^2H

V=18\left(\frac{\pi}{4}\right)\left(\frac{9\:in}{\frac{12\:in}{1\:ft}\cdot\frac{3ft}{1yd}}\right)^2\left(\frac{12ft}{\frac{3ft}{1yd}}\right)=\frac{9}{8}\pi\:yd^3

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