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The formula for circumference is 2(pi)r.

Plug the numbers into the formula.

You get (2)(pi)(4).

8(pi) or, assuming pi is 3.14, 25.12.

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Q: What is the circumference of a circle with a radius of 4 units?
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What is the circumference of a circle with a radius of 4 units round to the nearest hundredth?

A circle with a radius of 4 units has a circumference of 25.13 units.


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