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L kubus = 6 x s^2 = 6 x 9^2 = 6 x 81 = 486
108 = 12 x r
r = 108 : 12
r = 9
Maka;
Lp = 6 x r x r
Lp = 6 x 9 x 9
Lp = 486 cm2
JAWABAN : C