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

User Sergio Mendez
by
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1 Answer

5 votes
Area = πr² ⇒
81π = πr² ⇒ 81 = r² ⇒ r = √81 = 9 in

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