In $\Delta ABC$ and $\Delta PQR$,$AB = PR$,$BC = RQ$ and $\angle B = \angle R$,then $\Delta ABC \cong \Delta \ldots$

In $\Delta ABC$,$AD$ is a median. Prove that $AB + AC > 2AD$.

In $\Delta PQR$ and $\Delta XYZ$,if $\angle P = \angle Z$,$\angle Q = \angle Y$,and $PQ = YZ$,then $\Delta PQR \cong \Delta \ldots \ldots \ldots$

In $\triangle PQR$,$\angle P = 70^{\circ}$ and $\angle R = 30^{\circ}$. Which side of this triangle is the longest? Give a reason for your answer.

In the two triangles $ABC$ and $DEF$,$AB = DE$ and $AC = EF$. Name two angles from the two triangles that must be equal so that the two triangles are congruent. Give reason for your answer.

In $\Delta ABC$ and $\Delta XYZ$,$\angle A = \angle X$,$\angle C = \angle Z$ and $AB = XY$,then $\Delta ABC \cong \Delta \ldots \ldots \ldots$