Divide the known circumference by the value of Pi, and you'll have your answer !
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C=Pie X D C= 3.14 X 42 inches C=131.88 inches or 10.99 feet
The diameter of a circle with a circumference of 2.75 inches is: 0.875 inches (circumference divided by pi = diameter).
Diameter = 11.14 inches (approx) ~ Circumference can be found by pi * diameter.
Circumference = pi*diameter = 87.96 inches.
The circumference of a circle with a diameter of 45 inches is 141.37 inches.