alexbx619 alexbx619
  • 27-08-2017
  • Mathematics
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What is the circumference of a circle with area 81 \pi square inches?

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Banabanana
Banabanana Banabanana
  • 27-08-2017
Area = πr² ⇒
81π = πr²  ⇒  81 = r²   ⇒ r = √81 = 9 in

Circumference = 2πr = 2*9*π = 18π in
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