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90°+ angle AOC+30° =180°
120°+ angle AOC =180°
angle AOC = (180-120)°
angle AOC=60°
angle DOF =angle EOC =30° (Vertically opposite angles). (1)
angle AOF + angle DOF + angle BOD = 180°. ( linear pair)
90° + 30° + 3y = 180°
120°+3y =180°
3y=(180-120)°
3y= 60°
y=60/3
y= 20
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