Answer :


Join OB,


OA = OB [Radius]


OAB = OBA = 25°


In triangle AOB,


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


AOB + 25° + 25° = 180°


AOB + 50° = 180°


AOB = 130°


Now,


ACB = (1/2) AOB


ACB = (1/2) 130°


ACB = 65°


In triangle BEC,


EBC + ECB + BEC = 180°[Sum of angles of triangle]


EBC + 65° + 90° = 180°


EBC + 155° = 180°


EBC = 25°


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