If the diameter is 25 mm then the circumference is 78.54 mm.
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The circumference of a circle with a diameter of 2 feet is 6.28 feet.
the equation for the circumference of a circle is 2*radius*pi, or since the radius is half of the diameter 2*radius=diameter, we can simplify the equation to the circumference of a circle=diameter*pi
Circumference of a circle = 2*pi*radius or diameter*pi Its diameter = circumference/pi
The circumference of a circle with a diameter of 2 meters is: about 6.283 meters. This is a fairly easy calculation - simply multiply the diameter by Pi (about 3.1416). The result is the circumference.
Circumference of a circle = 2*pi*radius or diameter*pi