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Multiply by 123 = 1728 ie 1 cu ft = 1728 cu inches.
Just divide the number of inches by 12.
The circumference of a circle is 2*pi*radius. For a circle of radius 148, we'll divide by pi (which is approximately 3.14159) and divide the result by 2. 148/ 3.14159=47.1099 47.1099/2=23.55495
One foot = 12 inches, by definition. Therefore, a cubic feet (foot3) is equal to (12 inches)3, or 1728 cubic inches.
Find the cubic inches then divide by the value 12x12x12=1728. If 26 is the diameter then 3.14x13x13x24=12735.84 12735.84/1728=7.37 approximately. If 18 is the diameter then 3.14x9x9x24=6104.16 6104.16/1728=3.5325 approximately.