18.85 cm
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circumference = 6*pi cm
The answer depends on what measurement the 6 cm refers to: the diameter? circumference?
For the small circle of diameter 6, the circumference is 18.84.
If a circle has a diameter of 6 the circumference is about 18.9
A circle with a diameter of 6 has a circumference of 18.85. Half of that is 9.425