3 years ago

What is the circumference, in inches, of a circle with an area of 81π square inches?

1 answer:

5 0

If area is 81pi then 81pi=pir^2. Divide both sides by pi and we are left with r^2=81 take the square root of both sides to find the radius is 9 then plug that into the equation for circumference(2pir) so 2pi(9)=18 pi so the answer is E 18pi

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