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sudut abc+120°=180°
sudut abc=180°-120°
sudut abc=60°
b. sudut acb+sudut abc+sudut bac=180°
sudut acb+60°+55°=180°
sudut acb=180°-60°-55°
sudut acb=65°
c. sudut acg+sudut acb=180°
sudut acg+65°=180°
sudut acg=180°-65°
sudut acg=115°
maaf kalau salah