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r lingkaran sedang = 2r
r lingkaran besar = 3r
luas yg diarsir = 1/2π(3r)² - 1/2π(2r)² + 1/2πr²
=1/2π(9r²-4r²+r²)
=1/2π(6r²)
=3πr²
luas yang diarsir/luas lingkaran besar = 3πr²/π(3r)²
= 3πr²/9πr²
= 1/3
cmiiw
R₂ = 2r
R₁ = 3r