Question

The sum of the areas of two circles is 80 square meters. Find the length of a radius of each circle if

one of them is twice as long as the other.
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What is the radius of the larger circle?

Answer 1

Explanation:

let the radii be r and 2r

then π r²+π(2r)²=80

πr²+4πr²=80

5πr²=80

πr²=80/5=16

r=√(16/π)=4/√π

radius of larger circle=2×4/√π=8/√π

Answer 2

Answer: 60

Explanation:

80/2=40 80 x 2= 160/2=80