Answer:
Given: Here ABC is a triangle,
In which 
Prove: 
Let us assume AB is not congruent to AC.
If
,
Then
( By the converse of the triangle parts relationship theorem )
If If AB < AC, then
( by the converse of the triangle parts relationship theorem. )
But, by the definition of congruent,
We know
( by the given statement.)
Therefore, we have a contradiction,
And,
and
.
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