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Diameter of the circle: 34/pi = 10.823 cm rounded
34 pi cm = 106.8 cm
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
Diameter of a circle = circumference/pi
If the circumference of a circle is 17.27, the diameter is: 5.5