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48/75 = r₁²/r₂²
r₁ : r₂ = 4√3 : 5√3
= 4 : 5
L1/L2= πr1²/πr2²
48/75= (r1/r2)²
16/25=(r1/r2)²
4/5=r1/r2
4r2=5r1
r1 : r2 = 4 : 5