Every single one of them. What's strange is that anyone even uses something as inaccurate and antiquated as imperial units.
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Whichever you like, depending on what units you are required to work with; the units for any other measures that you might want to combine (imperial or SI).
The fraction of a circle that an arc covers is the angle of the arc divided by 2*pi radians, or divided by 360 degrees if you prefer Imperial Units.
A gallon is certainly not metric. It is imperial.
A rectangular prism that is 6 units by 4 units by 2 units has a volume of 48 cubic units.
2240 Imperial fl oz = 14 Imperial gallons.