Circumference = pi*diameter so diameter = circumference/pi
= 40/pi = 12.7324 feet (to 4 dp)
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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.
By definition pi is the ratio between the circumference and the diameter pi=C/D so C=pi*D and C=pi*40=125.6 (if pi=3.14)
The circumference of a 30-foot diameter circle is: 94.248 feet.