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C= 3.14 (pi) times the diameter.

If the radius of the circle is 3.4, then the diameter would be 6.8. Then, you would multiply 6.8 times 3.14 (pi), and your answer will be 21.352. (: Hope that this was very helpful! -Sorry if it wasn't-

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Q: What is the circumference the radius is 3.4?
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