Question

Given a line segment AB =10 cm. Draw a line perpendicular to it.

Answer 1

Draw a line segment $AB=10cm$

Open compass and draw curve upper and down side of line $AB$ at point $A$ and $B$

These curves cut each other at $C$ and $D$ as shown in the figure

Join $C$ to $D$ line

$CD$ is the line perpendicular to $AB$