Assuming 18 inch round is a measure of the circumference, the volume is approx 0.96 Imperial gallons.
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Two gallons is 256 fluid ounces.
how many 5/16 in an inch... rephrased: how many 5/16 in 1? Multiply by the reciprocal and reduce. 1* 16/5 = 16/5 = 3 and 1/5 = 3.2
If you use a standard 4-inch thickness you will need a minimum of 6.17 cubic yards.
231 cubic inches = 1 gallon1 foot = 12 inches8 ft = 96 inches5 ft = 60 inchesVolume = L W H = (96 x 60 x 1.8) = 10,368 cubic inches = (10,368 / 231) = 44.883 gallons (rounded)
Assuming that 1inch is your diameter, your radius is, of course, 0.5. Since the area of a circle is expressed asA=(pi)r2simply plug in the radius to this equation. You will get your area to be pi*0.25in2, which is roughly equal to 0.78539inches2.