Construction of a line segment of given length
Steps to construct a line segment of length 5 cm:
Draw line l. 

Mark a point on line and name it as P. 

Open the compass to measure the length of the line segment by placing the pointer on the 0 mark of the ruler and the pencil point on the 5 cm mark. 
Place the pointer of the compass on point P and swing an arc on the line to cut it at Q. 

$\overline{)\text{PQ}}$ is the required line segment of length 5 cm. 
Construction of copy of a given line segment:
Construction of a copy of line segment PQ.
Two lines are said to be perpendicular when they intersect each other at an angle of 90^{o}.
Construction of perpendicular lines
Construction of perpendicular to given line at a point on the line:
Construction of perpendicular to given line from a point outside the line:
The perpendicular bisector is a perpendicular line that bisects another line into two equal parts.
Construction of perpendicular bisector of line segment:
Construction of a line segment of given length
Steps to construct a line segment of length 5 cm:
Draw line l. 

Mark a point on line and name it as P. 

Open the compass to measure the length of the line segment by placing the pointer on the 0 mark of the ruler and the pencil point on the 5 cm mark. 
Place the pointer of the compass on point P and swing an arc on the line to cut it at Q. 

$\overline{)\text{PQ}}$ is the required line segment of length 5 cm. 
Construction of copy of a given line segment:
Construction of a copy of line segment PQ.
Two lines are said to be perpendicular when they intersect each other at an angle of 90^{o}.
Construction of perpendicular lines
Construction of perpendicular to given line at a point on the line:
Construction of perpendicular to given line from a point outside the line:
The perpendicular bisector is a perpendicular line that bisects another line into two equal parts.
Construction of perpendicular bisector of line segment: