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Question

In the given figure,O is the centre of the circle & ACB=60, Find angle OAB.



A

110

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B

70

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C

120

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D

30

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Solution

The correct option is C

30


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


Mathematics

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