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# GMATPREP - geometry

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Intern
Joined: 18 Jul 2008
Posts: 34

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14 Aug 2008, 14:50
Please see attached document for figure and problem.

I understand A is sufficeint, but can't understand how B is sufficient. Please explain. Thanks

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DS - Geometry.doc [80.5 KiB]

Senior Manager
Joined: 07 Jul 2005
Posts: 399

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14 Aug 2008, 16:08
You're given that AB = OC.

Recognize that OB = OC (radius of circle).

So AB = OC = OB.

Given that BCO is 40, then OBC is 40. Therefore, ABO is 140.

Because ABO is isoceles, BAO must be 20.

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Re: GMATPREP - geometry   [#permalink] 14 Aug 2008, 16:08
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# GMATPREP - geometry

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