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 $\text{△PRQ}$

$ABCD$ is a parallelogram. Find the values of $x$ and $y$.

In the given figure if $\mathrm{IV}=36$ meter, $\mathrm{VE}=20$ meter and $EB=15$ meter, then what is the width of the river? If the width of the river is $k \mathrm{m}$. Write the value of $k$.