x+40°+x+10°+50°=180°
2x+100°=180°
2x=80°
x=40°
угол М=40+40=80°
угол К=40+10=50°
угол N=50°
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x+40°+x+10°+50°=180°
2x+100°=180°
2x=80°
x=40°
угол М=40+40=80°
угол К=40+10=50°
угол N=50°