Question

Draw a line segment AB=6.8 cm and draw a perpendicular bisector.

Answer 1

$1.$Draw a line $AB=6.8$cm. Taking $A$ as center, and radius more than $\frac{1}{2}AB$,draw arcs on top and bottom of $AB$

$2.$Taking $A$ as center, and radius as before,draw arcs on top and bottom of $AB$

$3.$Let the point where arcs intersect on top of $AB$ be $P$.And the point where arcs intersect at the bottom be $Q$.Join $PQ$

$4.$Let $PQ$ intersect $AB$ at the point $M$.

Thus, line $PMQ$ is the required perpendicular bisector of $AB$.