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Geometry - Triangles / Circles

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by hongwang9703 » Tue Oct 27, 2009 5:43 pm
are those answers right? ps. are they gmatprep practice exam questions? or are they mgmat?
i got utterly defeated by the gmat.
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by chipbmk » Tue Oct 27, 2009 7:05 pm
hongwang9703 wrote:are those answers right? ps. are they gmatprep practice exam questions? or are they mgmat?
The answer choice chosen is incorrect.

I had guessed at that answer, as I did not know how to do it.

Upon trying this problem later, I was able to prove statement #2, but unable to prove Statement #1.

The correct answer choice is D.
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by hongwang9703 » Tue Oct 27, 2009 9:09 pm
think might have came up with something

there is a semi circle, therefore it is 180 degrees
angle COD is 60, therefore, angle AOC has to be 120.

Since Oc = BO = AB are equal (radius)
angle BAO = angle BCO

im not sure if this is right
i got utterly defeated by the gmat.
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Posts: 70
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by chipbmk » Wed Oct 28, 2009 6:48 am
hongwang9703 wrote:think might have came up with something

there is a semi circle, therefore it is 180 degrees
angle COD is 60, therefore, angle AOC has to be 120.

Since Oc = BO = AB are equal (radius)
angle BAO = angle BCO

im not sure if this is right
Even if angle BAO = angle BCO, given statement 2 alone. You do not know the degree of BCO do you?
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