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12x=48
x=4
sisi 1 = 3x4 =12 cm
sisi 2 = 4x4 =16 cm
sisi 3 = 5x4 =20 cm
keliling 12+16+20 =48
3 per 12 kli 48 =12
4 per 12 kli 48 =16
5 per 12 kli 48 =20
jumlahny sma yaitu 48