In Fig., mark the parallel lines using the notation single arrow, double arrow etc.. Mark the angle between perpendicular lines with a square symbol.
 
​​YCIND_250715_7423_15.svg

(i) How did you spot the perpendicular lines?
Perpendicular  lines are  ​​​​  lines which ​​ each other at ​​​​\(=\) ​​​ \(^\circ\)
 
 
(ii)  ​How many​ perpendicular angles marked in the given figure?
 ​
 
(iii) How did you spot the parallel lines?
Parallel lines are a pair of lines that lie on the ​​ plane, and ​​ however far we extend them at both ends.
 
(iv)How many​ set of parallel lines are there in the given figure?