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15²=17²-(r2+r1)²
(r2+r1)²=64
r2+r1=8
LA = π r1²
Lb=πr2²
La/Lb = (πr1²)/(πr2²)
1/9=(r1/r2)²
1/3=r1/r2
r2=3r1
r2+r1=8
3r1+r1=8
r1=2
r2=6