1.

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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