Semi circle

Since OC=OB=AB, angles BCO=OBC, and BAO=BOA.

COD=60, but it is not sufficient

OCB=40=OBC ==> COB=100, but insufficient

Taken together, you can find that BAO=20

so, C

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Tryingmybest: Master | Next Rank: 500 Posts; Posts: 168; Joined: Thu Nov 13, 2008 4:34 am; Location: Pittsburgh; Thanked: 9 times

by Tryingmybest » Mon Nov 24, 2008 7:45 am

Feruza Matyakubova Ans is D
Please use the link below for explanation

MAXX I think u aked this question in last 2 weeks
https://www.beatthegmat.com/gmat-prep-ge ... 22957.html

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orel: Master | Next Rank: 500 Posts; Posts: 247; Joined: Sun Jul 27, 2008 1:39 am; Thanked: 2 times; GMAT Score:660

by orel » Mon Nov 24, 2008 9:32 am

thanks,

shame on me

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