Tolong dijawab trimakasih

x = 180° - 145°
x = 35°
Sudut BAC :
2x = 2(35°)
2x = 70°
Jawaban D
#maafkalosalah

sudut BCA = 180° - 145° = 45°
180 = 35° + 180-3x + 2x
180° - 35° - 180° = -3x + 2x
35 = x

2x = 2.35
= 70° (D)