Answer :

AOB = 2 × ACB


AOB = 2 × 50°


AOB = 10


OA =OB [Radius of the circle]


OAB = OBA _________________ (i)


In triangle AOB,


OAB + OBA + AOB = 180°[Sum of angles of triangle]


2 OAB + 10 = 180°[From equation (i)]


2 OAB = 80°


OAB = 40°


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