__maths__>__Construction / Practical Geometry (basics)__>__Secondary Elements of Practical Geometry__### Perpendicular to a point not on a line

In this page, a short and to-the-point overview of constructing a perpendicular to a point not on a line is provided.

*click on the content to continue..*

Which of the following can help to construct a perpendicular to a line through a point outside the line?

- a set Square
- a compass
- a compass
- one of the above

The answer is "One of the above : set square or compass"

**Perpendicular to a Point** : Use the perpendicular edges of a set square, one edge on the given line and the other edge on the given point. Construct a line along the other perpendicular edge.

**Perpendicular to a Point** : Use a compass to mark points `L` and `M` on the line that are in equal distance from the given point `P`. Construct the perpendicular bisector of `bar(LM)`.

*slide-show version coming soon*