In Fig., mark the parallel lines using the notation single arrow, double arrow etc.. Mark the angle between perpendicular lines with a square symbol.
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(i) How did you spot the perpendicular lines?
\(Perpendicular\  lines\) are  ​​  lines which each other at ​​\(=\) ​
 
(ii)  Find the number of 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 do not meet however far we extend them at both ends.
 
(iv) Find the number of set of parallel lines are there in the given figure?