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12 x = 48
x = 4 cm
3x = 12 cm
4x = 16 cm
5x = 20 cm
sisi 2= 4x
sisi 3= 5x
jika keliling = 48cm
3x + 4x + 5x =48
12x =48
x = 48 : 12
x = 4
Jadi sisi 1= 3 x 4
= 12 cm
sisi 2 = 4 x 4
= 16 cm
sisi 3= 5 x 4
= 20 cm