happy4you
happy4you
10-04-2017
Mathematics
contestada
what is the radius of the larger circle
Respuesta :
apologiabiology
apologiabiology
10-04-2017
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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