That would depend on the wall thickness of the pipe. 54 inches is the outside diameter so subtract the pipe wall thickness (x2) adn you have the inside diameter.
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The diameter is essentially twice the radius, so therefore a circle with a radius of 54 inches has a diameter of 108 inches.
The circle's diameter is 8.291 units.
The answer will depend on what aspect of the circle is 54 inches: its radius or diameter.
The answer depends on what the 54 feet measures: the radius, diameter or circumference.
Circumference = pi*d = 169.65 inches (to 2 dp)