Measure the distance across the circle and multiply it by pi which is 3.14
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transitive
The answer depends on whether the 4 foot measure is the radius or the circumference.
For a 3 foot diameter pipe, 52.9 US gallons per foot of length.
6 ft x 2 ft is a measure of area in 2 dimensional space - even if you choose to call it a diameter. A metre is a measure of distance and cannot be used to measure an area.
A round pool with a 10-foot diameter and a 3-foot depth can hold up to 1,762 gallons of water.