In the below given figure, $AB\parallel CD$.Find the value of $x$.

In the below given figure, $AB\parallel CD$ and $BC\parallel FG$. If $\angle ABC=60°$, find $\angle GFH$.

In the below given figure, $l\parallel m$ and $p\parallel q$. Find the measures of $\angle a, \angle b, \angle c$ and $\angle d$.

In the below given figure, $l\parallel m$ and $p\parallel q$. If $\angle a=45°$, find $$

In the below given figure, lines $l$ and $m$ are cut by a transversal $t$. Find whether $l$ is parallel to $m$ or not.

In the below given figure, lines $l$ and $m$ are cut by a transversal $t$. Find whether $l$ is parallel to $m$ or not.

In the below given figure, $PQRS$ is a quadrilateral in which $PQ\parallel SR$ and $PS\parallel QR$. Prove that $\angle SPQ=\angle SRQ$.

In the below given figure, if $\angle x=\angle y$ and $\angle a=\angle b$, prove that $l\parallel n$.

In the below given figure, show that $AB\parallel EF$.