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What is the exact area of a circle with the circumference of 18 pi centimeters
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5 votes
What is the exact area of a circle with the circumference of 18 pi centimeters

User Porlune
by
7.6k points

1 Answer

5 votes
area=pi times r^2
circunference=2pi times r

circunference=18pi
18pi=2pi times r
divide both sides by 2
9pi=pi times r
divide both sides by pi
9=r

subsitute
area=pi times r^2
area=pi times 9^2
area=pi times 81
area=81pi

answer is area=81pi cm^2
User Molx
by
8.2k points
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