Estimate: 3*40 = 120 inches
Actual: pi*39 = 122.5 inches to one decimal place
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The circumference of a circle with a diameter of 45 inches is 141.37 inches.
The diameter of a circle with a circumference of 2.75 inches is: 0.875 inches (circumference divided by pi = diameter).
The circumference of a circle with a diameter of 394 inches is: 1,237.8 inches.
The circumference of a circle 30 inches in diameter is 30*pi inches
Circumference = pi*diameter = 87.96 inches.