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OABC is a quadrilateral, where O is the ...

OABC is a quadrilateral, where O is the centre of a circle and A, B, C are points in the circle, such that `angle ABC = 120^@`. What is the ratio of the measure of `angle AOC` to that of `angle OAC` ?

A

`3:1`

B

`3:2`

C

`2:1`

D

`4:1`

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The correct Answer is:
D
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