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If a circle has a circumference of 9, the diameter is: 2.864
The area of a circle with a diameter of 9.4 m is: 69.4 m2
The circumference of a circle with a diameter of 7m is 21.98 m
A circle with a diameter of 9 feet has a circumference of about: 28.27 feet (diameter x Pi = circumference).
The formula for the circumference of a circle is the same, whatever its diameter. Circumference = pi*diameter.