Question

The sum of the areas of two circles is 80π square meters. Find the length of a radius of each circle if one of them is twice as long as the other.
What is the radius of the larger circle?

Answer 1

Am very bad at explaining things but the answer is 8

Answer 2

Pi*r^2 is the area of a circle
if x is the radius of the smaller circle then
pi*(2r)^2+pi*r^2=80pi
5(r^2)pi=80pi
r^2=16
r=4
the larger radius is 2*4=8