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AB is a diameter of the circle with centre O, CD is chord of the circle. If ∠BOC = 120°, then the value of ∠ADC is
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- 42°
- 30°
- 60°
- 35°
- 42°
Correct Option: B
On the basis of question we draw a figure of a circle with centre O and AB is a diameter ,
Given , ∠BOC = 120°
∴ ∠AOC = 180° – 120° = 60°
Angle subtended at the centre by arc AC = 60°
| ∴ Angle subtended at the circumference by arc AC = ∠ADC = | = 30° | |
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