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The volume of a sphere is 4/3 pi R3 .

If the diameter is 18 inches, then the radius is 9 inches.

Volume = 4/3 pi (9)3 = 3,053.6 cubic inches = 13.22 gallons.

That's the volume of your sphere. We have no way of knowing

how much water may be in it. It may even be empty.

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Q: How many gallons of water in a 18 inch diameter sphere?
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