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ABC = 3x
ACB = 90° ( Menghadap tali busur )
maka :
CAO + ABC + ACB = 180°
2x + 3x + 90° = 180°
5x = 90°
x = 18°
ADC = ABC ( menghadap busur yg sama )
ADC = 3x
= 3×18
= 54° (C) .