1 Answer

Mtpultz · Answer 1 · 2018-12-25T20:12:23+0000

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

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