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= 12^2 / 4.3,14
= 144 / 12,56
= 11,46
B . L = K^2 / 4π
= 15^2 / 4.3,14
= 225 / 12,56
= 17,91
jadi perbandingannya 11,46 : 17,91
4 : 5
12/3 = 4
15/3 = 5
jadi perbandingan 12 cm dan 15 cm adalah
4 : 5