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22 / 7 x 12² : 22 / 7 : 8² (sama-sama dibagi 22 / 7)
12² : 8² = 144 : 64 = 9 : 4
L2 = phi × r2 × r2
L1 = 12 ×12
L2 = 8 × 8
= 9 : 4