GMAT Prep 1 DS 7

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GMAT Prep 1 DS 7

by starxx68 » Sun Dec 30, 2007 6:39 pm
I got B, but correct answer is A. Please help. Thanks!
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by samirpandeyit62 » Sun Dec 30, 2007 8:58 pm
1) ADB = 180 -2x, ABD =x

so triangle ADB is isoceles

hence BD = 6 & BC =6

2) x=36, no side given INSUFF

A
Regards
Samir