Identify the common arm, common vertex of the adjacent angles and shade the interior with two colours in the following figure. 

         

Identify the common arm, common vertex of the adjacent angles.

Name the adjacent angles in the following figure. 

Name the adjacent angles in the following figure. 

Observe the following picture. If the other angle of linear pair$=k°$, find $k$.

Observe the following picture. If the other angle of linear pair$=k°$, find $k$.

Observe the following picture. If the other angle of linear pair$=k°$, find $k$.

Observe the figure. There are two angles namely $\angle PQR = 150° \mathrm{and} \angle QPS = 30°$.  Is all this pair of supplementary angles a linear pair? Discuss. 

What would happen to the angles if we add $3$ or $4$ or $5$ rays on a line as given below?