Jawabanmu

2014-03-12T21:56:56+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