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15 January, 19:01

What is the circumference of a circle with area 81 / pi square inches?

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  1. 15 January, 19:25
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    Area = πr² ⇒

    81π = πr² ⇒ 81 = r² ⇒ r = √81 = 9 in

    Circumference = 2 πr = 2*9*π = 18π in
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