Converse of Isosceles Triangle Theorem
If two angles of a triangle are congruent, then the sides opposite to these angles are congruent.
Proof
Let S be the midpoint of 
.
Join R and S.
Since S is the midpoint of 
.
By the Reflexive Property,
It is given that 
.
Therefore, by SAS,
Since corresponding parts of congruent triangles are congruent,
