The diameter is essentially twice the radius, so therefore a circle with a radius of 54 inches has a diameter of 108 inches.
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The answer will depend on what aspect of the circle is 54 inches: its radius or diameter.
Circumference = pi*d = 169.65 inches (to 2 dp)
The answer depends on what the 54 feet measures: the radius, diameter or circumference.
radius = 54/(2*pi)
C=π x diameter (or twice the radius) 54 = π x d d = 54/π d=17.188733853924696263039446444232 in r=d/2 r = 8.5943669269623481315197232221158 in