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ACB = ABC

OAC = OAB = 55
BAC = OAC + OAB
BAC = 55 + 55 = 110


180 = 110 + ACB + ABC

karena ACB dan ABC sama, mari kita anggap keduanya adalah x

180 = 110 + x + x
180 = 110 + 2x
180 - 110 = 2x
70 = 2x
70/2 = x
35 derajat = x = ABC = ACB