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gmat prep DS geometry

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Manager
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gmat prep DS geometry [#permalink] New post 16 Aug 2006, 18:27
00:00
A
B
C
D
E

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(N/A)

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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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I can't understand one of the conditions. Thanks for your help.
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Manager
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 [#permalink] New post 16 Aug 2006, 19:17
rollingrock22 wrote:
Answer D
Angle = 20 degrees


Can you explain the answer please?

Last edited by sng on 16 Aug 2006, 20:43, edited 1 time in total.
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 [#permalink] New post 16 Aug 2006, 19:52
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
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SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

  [#permalink] 16 Aug 2006, 19:52
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