The circumference of a circle is calculated using the following formula:
C = π d
If the diameter ("d") is equal to 3 feet, then simply substitute in this value:
C = π * 3
C = 9.4 feet
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Circumference of a circle = 2*pi*radius or pi*diameter
The circumference of a 128-foot diameter circle is: 402.12 feet.
The circumference of a six-foot diameter circle is: 18.85 feet.
The circumference of a 4 foot circle is: 12.57 feet(diameter x pi = circumference).
Circumference of circle: 20 × π = 62.832 feet rounded to 3 decimal places