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84=12x
x=7 cm
sisi sisinya 3.7=21 dan 4.7=28 dan 5.7=35
12x = 84
x = 84/12
x = 7
sisi a = 3x = 3(7) = 21 cm
sisi b = 4x = 4(7) = 28 cm
sisi c = 5x = 5(7) = 35 cm