Circumference of a circle is: 2*pi*radius or pi*diameter
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9 feet 5.1 inches
You should say if the 9 feet is a radius, diameter or circumference.....if radius then 254.47 feet
circumference = 30*pi feet
The circumference of a circle with a diameter of 6 feet is about 18.85 feet.
The diameter of a circle with a circumference of 29 feet is about: 9.231 feet.