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If O is the centreof a circle of radi...

If `O` is the centreof a circle of radius `r` and `A B` is a chord of the circle at a distance `r/2` from `O ,` then `/_B A O=` `60^0` (b) `45^0` (c) `30^0` (d) `15^0`

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The correct Answer is:
`30^@`
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