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R A = 1,75
R B = 7
maka :
L A : LB
πRA² : πRA²
1,75² : 7²
3,06 : 49
7 x 7 x 22/7 = 154 -> B
9.7 : 154 = 1:15,... -> mendekati 1:16
jawaban C. 1:16