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Jadi, Sudut AGH = 118°
Sudut AGC = 180°, karena sudut pelurus
Jadi,
118° + 3y + 5° = 180°
3y = 180° - 118° - 5°
3y = 57°
y = 57 : 3
y = 19° (B)
maaf klo salah :)