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ravikirancheni
- Junior | Next Rank: 30 Posts
- Posts: 24
- Joined: Sat Sep 20, 2008 10:06 am
- Location: JAPAN
In Isosceles triangles 2 angles are same.
we need to find the angle R
from 1 angle T is 100 means the measure of the other two angles should be 80 and so angle R is 40 (isosceles triangle ) sufficient.
from 2 angle s is 40 means there are two possibilities
1. s=40 and other 2 angles t=70 r=70
2. s=40 or (t or r =40) and remaining angle is 100
so insufficient.
so the answer is A
