E. B and C are on the same straight line, Ba bisects ∠ EBD, ∠ DBC = 30 °. Calculate the degree of ∠ ABC

Because e, B and C are on the same line, ∠ DBC = 30 degree
Therefore, EBD = 150 degree
Because Ba bisects EBD, so abd = 75 degree
Therefore, ABC = abd + DBC = 105 degree

RELATED INFORMATIONS

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