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A=180°-(180°-115°)-(180°-150°)
A=180°-65°-30°
A=85°
<C = sudut pelurus maka 180° - 150°= 30°
< B = sudut pelurus maka 180° - 115° = 65°
segitiga = 180°
< A + <B + <C =180° 30°+ 65° = 95°
180° - 95° = 85° <A = 85°