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Architectural Drafter

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AVG. SALARY

$57,200

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EDUCATION

Associate's degree

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JOB OUTLOOK

Stable

Real-Life Activities

Real-Life Math -- Solution

The first step in solving this type of question is to illustrate it.

This graphic shows an illustration of the "tube."

tube.gif

The tube resembles a cylinder, as you can see.

The next step is to calculate its volume using the following formula:

vol_form.gif

We already know the value of pi equals 3.14. As for r, it is half of the diameter. So it equals 6 inches. And as for h, it is 4 feet or 48 inches.

Volume = 3.14 x 62 x 48
Volume = 5,425.92 cubic inches

So you need 5,425.92 cubic inches for 1 tube. So for 4, you would need 21,703.68 cubic inches of concrete.

Now you just need to convert that figure into cubic feet.

Since 1 cubic foot has a value of 1,728 cubic inches -- 12 x 12 x 12 -- you just have to divide 21,714.68 by 1,728.

The final answer is 12.57 cubic feet.