The formula for the circumference of a circle is 2.pi.r where r= the radius, since the diameter is 2.r (two times the radius),the circumference will be pi.diameter.
pi=3.14159...
so for a diameter of 34mm
the circumference=pi.34=106.8mm
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Diameter of the circle: 34/pi = 10.823 cm rounded
34 pi cm = 106.8 cm
Circumference: 0.75 times pi = 2.356 inches rounded to three decimal places
An American pennys diameter is 19.05mm, and using the formula C = Pi*2r = Pi*d. in circumference it is approximately 59.84 mmThe circumference of a [UK] penny is 63.8 mm approx.