Jawabanmu

2014-03-24T21:50:37+07:00
L1/L2 = πr₁²/πr₂²
48/75 = r₁²/r₂²
r₁ : r₂ = 4√3 : 5√3
         = 4 : 5
2 3 2
2014-03-24T21:58:00+07:00
L=πr²

L1/L2= πr1²/πr2²
48/75= (r1/r2)²
16/25=(r1/r2)²
4/5=r1/r2
4r2=5r1

r1 : r2 = 4 : 5