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# gmat prep DS geometry

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Manager
Joined: 28 May 2006
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Location: New York, NY
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gmat prep DS geometry [#permalink]  16 Aug 2006, 18:27
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I can't understand one of the conditions. Thanks for your help.
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Manager
Joined: 28 May 2006
Posts: 152
Location: New York, NY
Followers: 2

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rollingrock22 wrote:
Angle = 20 degrees

Last edited by sng on 16 Aug 2006, 20:43, edited 1 time in total.
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Joined: 20 Nov 2005
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Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
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D

We know AB = OC = OB
So triangle ABO and BCO are isosceles triangles.

St1:
COD = 60
Let BAO = BOA = x
then OBC = x+x = 2x = BCO

BOC = 180-4x
Now x + 180-4x+60 = 180
hence x= 20: SUFF

St2: As solved in statement1 we know have 2x = 40
so x = 20: SUFF
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

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