Circumference = pi*diameter = pi*2.5 = 7.85 inches, approx.
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The diameter of a circle with a circumference of 25 inches is: 78.54 inches. (d = c divided by Pi).
25*pi inches
It is: 25/pi which is about 8 inches
C = ~78.54 inches.
The diameter of a circle with a circumference of 2.75 inches is: 0.875 inches (circumference divided by pi = diameter).