Four real life examples for vertically opposite angles are given below.

Give four more examples for vertically opposite angles in your surrounding.

 

In the given figure, two lines $\overleftrightarrow{AB}$ and $\overleftrightarrow{CD}$ intersect at $O$. Observe the pair of angles and complete the following table.

Name the two pairs of vertically opposite angles.

Find the value of $x$ in the given figure.

Name the pairs of adjacent angles. 

The angle $\angle JIL$ in the given figure is $a°$. Write the value of $a$.

If the angle $\angle GEH=x°$ from the given figure, find $x$.