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AO = BO
AO = BO
maka BAO = BCO
44° = BCO
BCO = ACB
44° = ACB
ABC + BCA + BAC = 180
ABC + 44° + 44° = 180°
ABC + 88° = 180°
ABC = 92°
ABO + CBO = ABC
X + X = 92
2X = 92°
X = 46°
ABO + BAO + AOB = 180
46° + 44° + AOB = 180°
90° + AOB = 180°
AOB = 90°