Well the formula for that problem is C=Pi*d or circumference= 3.14 times the diameter. Figure it out from there.
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If a circle has a circumference of 9, the diameter is: 2.864
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.
The circumference of a circle with a diameter of 3 meters is: 9.42 meters (diameter x Pi = circumference).
The circumference of a circle with a diameter of 7m is 21.98 m