The area of a circle is 81π ft². What is the circumference, of feet? Express your answer in terms of π

asked Jun 1, 2023 129k views

24 votes

by JeffO

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Answer:

18π

Explanation:

81π = πr²

√81 = √r²

9 = r

C = 2πr

C = (2)(π)(9)

C = 18π

Borisdonchev answered Jun 6, 2023

5.8k points

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