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If A B ,\ B C\ a n d\ C D are equal ch...

If `A B ,\ B C\ a n d\ C D` are equal chords of a circle with `O` as centre and `A D` diameter, then `/_A O B=` `60^0` (b) `90^0` (c) `120^0` (d) none of these

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In a circle chords, `AB=BC=CD,O` is the center of the circle.
We know that equal chord make equal angle at the center
`/_AOB=/_BOC=/_COD`
`/_AOB+/_BOC+/_COD=180^0`(because Angles on the same side of straight line add up to `180^0`)
`3/_AOB=180^0`
`/_AOB=180/3=60^0`
So correct option is `/_AOB=60^0`
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