Question

It is given that ΔABC≡ΔDEF is it true to say that AB=EF ? justify your answer

Answer 1

No, not in all cases.
The sides which arr congruent can be any of the three.
AB=DE or EF or DF
The same for other sides.

Answer 2

Yes becoz
AB AND EF
ARE CORRESPONDING PARTS OF CONGRUENT TRIANGLES. (CPCT)