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Join OC and OD.

ABC = BCD = 25°[Alternate angles]

The angle subtended by an arc of a circle at the center is double the angle subtended by the arc at any point on the circumference.

BOD = 2 × BCD

BOD = 2 × 25°

BOD = 50°

Similarly,

AOC = 2 × ABC

AOC = 2 × 25°

AOC = 50°

Now,

AOB = 180° [AOB is a straight line]

AOC + COD + BOD = 180°

50° + COD + 50° = 180°

100° + COD = 180°

COD = 80°

CED = (1/2) COD

CED = (1/2) 80°

CED = 4

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