A circle has an area of 81 square feet what is its radius?

i need a formula or some type of way to do it.
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2 Answers

serkel area=pi*r*r=81

so r=root(81/pi)

81/3.14159265=25.78310081

root=5.077706255
by
5.078 is he correct answer
by Level 6 User (18.9k points)

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