Volume of a cylinder = cross-sectional area times height
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The volume of a 300mm diameter by 600mm deep cylinder is: 42,412,000 mm3
21.206 cubic feet.
cylinder 18 feet diameter x 1.5 feet deep volume = 381 cubic feet
For this, you can work out the volume of the cylinder of sand you need to fill. But you'll also need to know the density of the sand to convert this volume into weight.
the volume of the cylinder is height*pi*radius^2, in this case 27*3.14*30^2, equaling 76,341 cubic inches. Since 1 cubic inch = .004329 gallons, the answer is ~330 gallons