1)∠B=120°
2)∠A=105° ∠B=75°
3)∠A=150° ∠B=30°
4)∠1=55° ∠2=125° ∠3=125°
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1)∠B=120°
2)∠A=105° ∠B=75°
3)∠A=150° ∠B=30°
4)∠1=55° ∠2=125° ∠3=125°