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How to figure out how to do this problem

How to figure out how to do this problem-example-1
User Jpbalarini
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The circumference should be 37.68 because area= pi *r^2. So if area=pi*36, then the radius must be 6 which makes the diameter 12 and circumference=pi*diameter and 3.14*12= 37.68. So circumference of the circle is 37.68!
User BanikPyco
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