Since the circumference is equal to the diameter times pi, you need to divide the circumference by pi in this case.
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If a circle has a diameter of 5 the circumference is: 31.4
The diameter of a circle who's circumference is five is: 1.592
The circumference of a circle if the diameter is 5 inches is 15.7 inches.
If the diameter of a circle is 9 the circumference is: 28.3
The circumference of a circle with a diameter of 51m is: 160m