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What is the radius of the larger circle
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What is the radius of the larger circle

What is the radius of the larger circle-example-1
User Cody Mikol
by
8.4k points

1 Answer

2 votes
a=pir^2

80pi=pir^2+pi(2r)^2
80pi=pir^2+4pir^2
undistribute pi
80pi=pi(r^2+4r^2)
add like terms
80pi=pi(5r^2)
divide both sides by pi
80=5r^2
divide both sies by 5
16=r^2
sqrt both sides
4=r
2r=8

the radius of larger is 8 meters
User Mtpultz
by
7.8k points
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