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Generally lumber is measured in linear feet, but to find the cubic feet or volume of a cylindrical object the formula you use is, Pi times radius squared, times length or height. so if you had a log that was 3 ft across and 40 ft long you would use the formula 3.14(pi rounded down you can use the button on your calculator and get a more accurate number) x 1.5 x 1.5 x 40 = 282.6 cubic ft.
Hope it helps
Karp
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