Draw a line segment $AB=5.6cm$ and draw its perpendicular bisector. Measure the length of each part.

Steps of construction:

Construct a line segment $AB=5.6cm$

Considering $A$ as centre and radius more than half of line segment $AB$, draw two arcs on the each side of the line segment $AB$

Considering $B$ as centre and radius more than half of line segment $AB$, draw arcs which cuts the previous arcs at the point $P$ and $Q$

Join the points $PQ$ such that it intersects the line segment $AB$ at the point $M$ 

Therefore, $PQ$ is the perpendicular bisector of the line segment $AB$.

So the length of each part is $AM=BM=2.8cm$