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Question

Question 9
In the figure, BC is a diameter of the circle and BAO=60. Then, ADC is equal to

(A) 30
(B) 45
(C) 60
(D) 120

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Solution

(C) 60

Given, BAO=60
In ΔAOB
OA = OB
OBA=BAO [angles opposite to equal sides are equal]
BAO=OBA=60

We know that, ABC=ADC [ angles in the same segment AC are equal]
ADC=60

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