# <span lang="EN-US Join OB,

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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