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The equation for circumference is C = 2*pi*r, where r is the radius of the circle and pi is a constant = 3.14159...

Assuming that you mean a 9cm radius, the circumference is therefore:

C = 2*pi*r = 2*pi*9cm = 18cm*pi = ~56.549cm

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Q: What is the cicumfrence of a 9cm circle?
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