SOLUTION: What happens to the circumference of a circle if the length of the radius is doubled?

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Question 899735: What happens to the circumference of a circle if the length of the radius is doubled?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
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Here is an expression for circumference of a circle: 2%2Api%2Ar

What is double the length of that radius?
2r

What is the circumference now?