geometry
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NICE question
1statment <BCO> AB=OB=OC
Now angles opp to equal sides are equal => <bco =<obc =<oab ---- suff
2nd statment <COD = 60 ....<COD is exterior angle of Trngle AOC therefore <COD is twice <CAO (which can also be written as <BAO)-----suff
1statment <BCO> AB=OB=OC
Now angles opp to equal sides are equal => <bco =<obc =<oab ---- suff
2nd statment <COD = 60 ....<COD is exterior angle of Trngle AOC therefore <COD is twice <CAO (which can also be written as <BAO)-----suff