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Source: — Data Sufficiency |
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by anshumishra » Sat Jan 22, 2011 5:33 pm
GHong14 wrote:Image
∠BAO = x = ?
∠BOA = x , as AB = CO = OB (radius of the semi-circle)
∠OBC = ∠BAO + ∠BOA = 2x
∠OCB = ∠OBC = 2x (As OC = OB)

Statement 1:

∠COD = 60
Since, ∠BOA + ∠BOC+∠COD = 180
=> x + (180-4x) + 60 = 180 -- Sufficient

Statement 2:
∠BCO = 40 = 2x -- Sufficient

Hence, D
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by Night reader » Sat Jan 22, 2011 5:47 pm
:)
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