Question

Draw a line segment $AB$ of $4$ cm in length. Draw a line perpendicular to $AB$ through $A$ and $B$, respectively. Are these lines parallel?
If true write $1$ and if false then write $0$

Answer 1

The lines are perpendicular to a common line $AB$. Hence, the angle between these lines will be ${90}^{\circ }+{90}^{\circ }={180}^{\circ }$
Since, the angle between them is ${180}^{\circ }$, the lines are parallel to each other.