VA ROG! DAU COROANA SI MA ABONEZ !
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1)60°-40°=20
2) 90°-50°=40°
x+x=40°
2x=40°
x=40°: 2
x=20°
3) 180°-90° =90°
2x+x=90°
3x=90°
x=30°
2x=30°•2
2x=60 °