- 1). Measure the diameter of the pipe. For example, assume the pipe has a diameter of four feet.
- 2). Determine how accurate your measurement needs to be. If you need a general estimate, you can use 3.14 as pi. If you need more accurate measurements, you should carry pi out to more decimals. Pi begins at 3.14159265 and continues from there.
- 3). Multiply the diameter by pi. In the example, four feet times 3.14 equals 12.46 feet.
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