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Question

In the given figure,O is the centre of the circle. IfACB=60then find OAB.



A

120

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B

60

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C

90

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D

30

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Solution

The correct option is D

30


Given AOB=120
(The angle subtended by an arc of a circle at the centre is double the angle subtended by it at any point on the remaining part of the circle)
OA = OB (Radius of the circle)



x+x+120=180
2x=60
x=30


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