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Verified answer
➡Sudut garis lurus = 180°Maka,
Sudut B :
= 180° - 115°
= 65°
Sudut C :
= 180° - 150°
= 30°
➡Sudut ∆ merupakan sudut 180°
Maka,
A + B + C = 180°
A + 65° + 30° = 180°
A + 95° = 180°
A = 180° - 95°
A = 85°
Jawaban D