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Răspuns:
< (AOB )+ m ( < BOC) + m ( < COD) + m ( < AOD) = 360 °
X+ 2•X +10 + 3• X -5 + 4 • X + 5 = 360 °
10 X + 10 = 360 °
10X = 350
X = 35° 》 m (< AOB) = 35 °
m ( < BOC) = 80°
m ( < COD) = 100°
m ( < AOD) = 145°