Answer:
The central angle at AOC = 120
Therefore angle ADC = 120/2
= 60
Considering the Triangle ABD, it is right triangle( as it passes through the diameter of the circle)
Hence Angle ADB = 90
ADB = ADC + CDB
90 = 60 + x
Therefore , x =90 - 60
=30
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Answer:
The central angle at AOC = 120
Therefore angle ADC = 120/2
= 60
Considering the Triangle ABD, it is right triangle( as it passes through the diameter of the circle)
Hence Angle ADB = 90
ADB = ADC + CDB
90 = 60 + x
Therefore , x =90 - 60
=30