circumference of a circle = pi * diameter.
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The circumference of a circle with a diameter of 18 inches is 56.5 inches.
The formula; 2 * Pi * Radius = circumference Will calculate the circumference of a circle.
Circle's circumference = 2*pi*radius or diameter*pi
Circumference of a circle = pi*diameter or 2*pi*radius
To find the circumference of a circle the formula is: 2*pi*radius or diameter*pi