5cm
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Assumed that the circle's radius is 2.5 cm, then circumference is pi x 2 x 2.5 = 5pi cm
Diameter in cm = circumference/pi
A circle with a radius of 9.3 cm has a circumference of 58.43 cm
Circumference of the circle = pi*17.6 cm
It has a circumference of 12.88 cm