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The circumference of circle with area 81 π2 eqval to |
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Answer» Answer is 18π Step-by-step EXPLANATION: Given AREA of a circle is 81π. We know formula for area of a circle is πr^2 So,πr^2=81π ⇒r2=81 ⇒r=9 Formula for circumference is 2πr. So PUTTING r=9 circumference will be 2π9=18π HENCE PROVED. |
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