To find the diameter from the circumference, you can use the formula ( C = \pi \times d ), where ( C ) is the circumference and ( d ) is the diameter. Rearranging the formula gives ( d = \frac{C}{\pi} ). For a circumference of 3.15 inches, the diameter is approximately ( \frac{3.15}{3.14} ), which is about 1 inch.
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31.4 in
circumference = pi*diameter so diameter = circumference/pi = 4.456 inches
Diameter = Circumference/pi = 1.91 inches, approx.
Circumference = 37.7 inches Diameter = 12 inches
A circumference of 66.76 inches.