In the figure given below, $AF\parallel BD$ and $AF$ is a bisector of $\angle EAC$. If $\angle EAC=70°$, find the measure of $\angle ABC$ and $\angle ACD$. 

  

In the figure given below, $AB\parallel CD$. If $\angle EAB=50°$ and $\angle ECD=100°$, find $\angle AEC$. 

In the figure given below, $l\parallel m$ and $l\parallel n$. Find the values of $x,y \text{and} z$.

In the figure given below, $l_1\parallel l_2$ and $l_3\parallel l_4$. Find the values of $p,q,r \text{and} s$.

In the figure given below, $l\parallel m$ and $m\parallel n$. Find the values of $x,y \text{and} z$.

In the figure given below, $l\parallel m$. Find the value of $x$.

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

Prove that through a given point, we can draw only one perpendicular to a given line.

In the following figure, find the values of $x$ and $y$.