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Assuming that "it" refers to diameter, the radius is 7 cm and the circumference is 44.0 cm.
If you mean 3.14 for pi then the circumference is: 7*3.14 = 21.98 cm
Circumference of the circle = pi*17.6 cm
It has a circumference of 12.88 cm
Diameter in cm = circumference/pi