Circumference = Pi x diameter
Therefore
Circumference = Pi (3.1416) multiplied by 3 feet:
Circumference = 9.425 feet, to 3 decimal places. (There is no need to quote Pi to more than four decimal places, then you can remember it)
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A circle with a diameter of three feet has a circumference of 9.4 feet.
The ratio between the diameter of a circle and its circumference is constant: π. A circle whose circumference measures 3 feet has a diameter of 3/π feet: approximately 11.459 inches.
If the circumference of a circle is 20 feet the diameter is: 6.366 feet (circumference divided by pi = diameter).
The circumference of a circle with a diameter of 50 feet is about 157.1 feet. (diameter x Pi = circumference).
A circle with a diameter of 9 feet has a circumference of about: 28.27 feet (diameter x Pi = circumference).