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hope this helps you.
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(ii)
angle AOC= 90 °
angle COD=4x
angle DOB=x
angle AOC + angle COD + angle DOB= 180 ° ( sum of straight line measures 180 °)
90 + 4x+x= 180 °
4x+x=180°-90°
5x=90°
x=90\5
x= 18°
4x = 4*18° = 72°
angle AOC= 90 °
angle COD=4x
angle DOB=x
angle AOC + angle COD + angle DOB= 180 ° ( sum of straight line measures 180 °)
90 + 4x+x= 180 °
4x+x=180°-90°
5x=90°
x=90\5
x= 18°
4x = 4*18° = 72°
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