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The circumference of a circle is 18π, what is the radius?

User Corbie
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1 Answer

4 votes

Answer: 9

Explanation: Because pi is included in the answer, you won't be multiplying pi with it.
The only number that equals to 18 is 9.
By using the formula for circumference is: 2πr
2 x 9 = 18
Add pi, 18π.

User Elmi
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