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12x = 180
x = 15
/BAC = 4x = 4(15) = 60°
Jadi, besar /BAC adalah 60°
Semoga membantu
12x = 180
x = 15
sudut a = 4x = 60
sudut b = 3x = 45
sudut c = 5x = 75
dah.. maap ya kalo salah :)