Perpendicular Lines and Perpendicular Bisector

 Perpendicular Lines

• If two lines intersect with each other and form an angle of 90° then they must be perpendicular to each other.

Here AB and MN are intersecting at point N and form a right angle. 

• We will write it as AB ⊥ MN or MN ⊥ AB
• Read as AB is perpendicular to MN or MN is perpendicular to AB.

Perpendicular Bisector

• If a perpendicular divides another line into two equal parts then it is said to be a perpendicular bisector of that line.

 Here, CD is the perpendicular bisector of AB as it divides AB into two equal parts i.e. AD = DB.