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Source: — Data Sufficiency |
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by sudhir3127 » Wed Aug 13, 2008 3:29 am
IMO D..

We know AB = OC = OB

let Angle BAO = Angle BOA = X

Angle ABO = 180 - 2X, therefore angle CBO = 2x.

since OC = OB angle CBO = angle BCO = 2X, angle BOC = 180 - 4X

hence angle COD = 180 - (180-4X) - X = 3X


statement 1 Angle COD = 3x = 60 , X = 20 angle BAO = 20.....
sufficient

Statement2: Angle BCO = 2x = 40 , X = 20 angle BAO = 20 ..... sufficient

hence D
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