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r1 : r2 = 3 : 4
Ditanyakan : F1 : F2 ?
Dijawab :
A = πr²
Jadi :
F1/F2 = πr1² / πr2²
F1/F2 = 3² / 4²
F1/F2 = 9/16
Jadi F1 : F2 = 9 : 16
jawaban C