In the adjoining figure, identify the pairs of alternate interior angles.

In the adjoining figure, identify the pairs of interior angles on the same sides of the transversal.

In the adjoining figure, identify the vertically opposite angles.

In the adjoining figure, $\mathrm{p}\mathrm{}\left|\right|\mathrm{}\mathrm{q}$. Find the unknown angles.

Find the value of $x$ in the following figure if $l\mathrm{}\left|\right|\mathrm{}m.$ {write only numerical value without degrees symbol}

Find the value of $x$ in the following figure if $l\parallel m.$

In the given figure, the arms of two angles are parallel. If $\mathrm{\angle }\mathrm{A}\mathrm{B}\mathrm{C}\mathrm{}=\mathrm{}{70}^{\mathrm{o}}$, then find $\mathrm{\angle }\mathrm{D}\mathrm{G}\mathrm{C}$ (without degree).

In the given figure, the arms of two angles are parallel. If $\mathrm{\angle }\mathrm{A}\mathrm{B}\mathrm{C}\mathrm{}=\mathrm{}{70}^{\mathrm{o}}$, then find $\mathrm{\angle }\mathrm{D}\mathrm{E}\mathrm{F}$.{write only numerical value without degrees symbol}

In the given figure below, decide whether $l$ is parallel to $m$. Write "Yes" or  "No".