ABC + ADC = 180, ABC = 120;
CBO= ABC - ABO= 70
BCO + COB + OBC = 180, 70+70+BCO= 180, BCO = 40
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ABC + ADC = 180, ABC = 120;
CBO= ABC - ABO= 70
BCO + COB + OBC = 180, 70+70+BCO= 180, BCO = 40