Tolong dijawab ya guys,pake jalan,besok dikumpul,hehe

Dik:
AC = 5x
AB = 12x
CB = 9x+8
L ABC = 120 cm²

•) L = 1/2 x a x t
120 = 1/2 × 12x × 5x
120 = 1/2 × 60x²
60x² = 240
x² = 240/60
x = √4
x = 2

•) AC = 5x = 5(2) = 10 cm
AB = 12x = 12(2) = 24 cm
CB = 9x+8 = 9(2)+8 = 26cm

Jadi, keliling ABC adalah
K = AC + AB + CB
K = 10 + 24 + 26
K = 60 cm