The answer will depend on what aspect of the circle is 54 inches: its radius or diameter.
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Circumference = pi*d = 169.65 inches (to 2 dp)
A circle with a radius of 6 inches has a circumference of 37.7 inches.
The radius of a circle with a circumference 36 inches is: 5.73 inches.
A circle with a radius of 16 inches has a circumference of 100.53 inches.
A circle with a radius of 10 inches has a circumference of 62.8 inches.