Give examples for the given statement and give reasons:
If two polygons are congruent, then they are similar as well.

Check for similarity in the triangles and explain which criterion is used.

$\text{△YXN}$ and $\text{△XNZ}$

Check for similarity in the triangles and explain which criterion is used.

$\text{△OAB}$ and $\text{△OKT}$

Check for similarity in the triangles and explain which criterion is used.

$\text{△ADC}$ and $\text{△ACB}$

Check for similarity in the triangles and explain which criterion is used.

$\text{△CED}$ and $\text{△PRQ}$