Answer :

ABCD is a cyclic quadrilateral

ADB = 30°


DCA = 80°


ADB = ACB = 30° (Angle on the same segment)


Now,


BCD = ACB + DCA


= 30° + 80°


= 110°


OAB + BCD = 180°


OAB + 110° = 180°


OAB = 70°

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