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12 in = 1 ft
radius = diameter ÷ 2
Assuming those are internal dimensions, the volume of the pool is:
volume = π x radius2 x depth
= π x (12 ft ÷ 2)2 x (30 ÷ 12) ft
= 90π cu ft
≈ 282.74 cu ft
Conversion to gallons depends upon which gallon you're using:
- 1 cu ft ≈ 6.23 imperial gallons → 282.74 cu ft ≈ 1761.16 imp gallons
- 1 cu ft ≈ 7.48 US gallons → 282.74 cu ft ≈ 2115.07 US gallons
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