Ответ:
<1=180°-30°=150°
<2=30°+30°=60°
<3=<1=150°
<4=180°-(30°-30°)=120°
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Ответ:
<1=180°-30°=150°
<2=30°+30°=60°
<3=<1=150°
<4=180°-(30°-30°)=120°