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The diameter of a circle with a 12-foot circumference is about 3.82 feet. (circumference divided by Pi = diameter).
The circumference of a 8 foot diameter circle is about 25.13 feet.
The circumference of circle with 60-foot diameter is: 188 feet.
The circumference of a circle with a diameter of 18 yards is: 56.55 yards (diameter x Pi = circumference).
Circumference = pi*diameter so diameter = circumference/pi = 40/pi = 12.7324 feet (to 4 dp)