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Pie (3.14159...) times (*) 2 times (*) radius === or This equation may be for the area but hopefully it's for circumference. Anyway, the answer to your question is 25.13274123... (Pie times 2 times 4mm).

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Anonymous

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4y ago

25.13

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Q: What is the circumference of a circle with a radius of 4mm?
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