Question
ΔABC and ΔDEF have sides of lengths a, b, c and d, e, f respectively (symbols are as per usual notations). a, b, c, and d, e, f satisfy the relation 
then -
- Both the triangles ABC and DEF must be isosceles but not equilateral
- Both the triangles ABC and DEF must be equilateral
- Both the triangles ABC and DEF must be similar but may not be congruent
- Both the triangle ABC and DEF must be similar
The correct answer is: Both the triangle ABC and DEF must be similar
the equality will take place if 
triangle must be similar.
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