Divide the circumference by pi, and you'll get the answer. 19.74 cm.
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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
Circumference of the circle: 7.4*pi cm