This is the formula for circumference: C = Pi x D, where Pi = 3.1416 and D is diameter. Just sub in the known numbers to solve: 61 = 3.1416 x D 61 ÷ 3.1416 = D 19.416857 = D
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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.
Circumference = 37.7 inches Diameter = 12 inches