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Source: — Data Sufficiency |
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by Uri » Sat Apr 04, 2009 1:15 pm
IMO: (A)

Angle BCD = Angle BDC
Thus, BD = BC
Again, Angle BDC = Angle DBA + Angle BAD
Therefore, Angle DBA = Angle BAD = x
Thus, BD = DA
So, from earlier derivation, BC = BD = DA
If AD = 6, BC = 6.
So, (1) is sufficient.

With only the measures of angles it is not possible to find out the length of any side of any triangle. So, (2) is insufficient.

OA please.
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by subhasis8877 » Sat Apr 04, 2009 8:41 pm
Great.. Thanks
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