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sudut zyx=180°-120
sudut zyx=60°
sudut zyq+ sudut zyx=180°( karena pelurus)
sudut zyq+60°=180°
sudut zyq=180°-60°
sudut zyq=120°
maaf kalau salah
oke aku kasih tingkat cerdas ya please
semoga bermanfaat