Ответ:
180°-(50°-90°)=180°-140°=40°-D
180°-90°=90°:2=45°- B, D
C =45°+45°=90°
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Ответ:
180°-(50°-90°)=180°-140°=40°-D
180°-90°=90°:2=45°- B, D
C =45°+45°=90°