Perpendicular Lines

What do you mean by perpendicular?

If  $\mathrm{AB}\perp \mathrm{CD}$ then we write that line  $\mathrm{AB}$ is perpendicular to $\mathrm{CD}$.State true or false.

If a line $\mathrm{AB}$ is perpendicular to $\mathrm{CD}$, we write  $\mathrm{AB}\perp \mathrm{CD}$.

If line segment $\mathrm{AB}$ is the perpendicular bisector of the line segment $\mathrm{CD}$ at $\mathrm{O}$. Find the value of $\mathrm{\angle }\mathrm{BOC}$. (Write the answer without degree symbol)

Which of these can divide a line segment into two equal halves?