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subhasis8877
- Senior | Next Rank: 100 Posts
- Posts: 77
- Joined: Tue Mar 10, 2009 3:10 am
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.
