geography GMAT Prep

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geography GMAT Prep

by vinviper1 » Thu Aug 28, 2008 10:54 am
Thanks!
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by pre-gmat » Thu Aug 28, 2008 11:12 am
Anser should be A.

The exterior angle to Triangle ABD is Angle BDC which is 2x.

The exterior angle equal to the sum of the two opposing interior angles.

So AD=BD=BC=6

2 is insufficient.