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sudut A1 + A4 = 180°
sudut A2 + A3 = 180°
sudut B1 + B4 = 180°
sudut B1 + B4 = 180°
Jika A2 = 78° maka A3 = 180 - 78 = 102°
Sudut A3 = B3
Jadi jawabannya C, 102°