Using a Ruler and Drafting Triangle

Constructing Parallel and Perpendicular Lines

So, you want to draw a parallel line that has to pass through a point?

Easy to do using our "sliding triangle" technique below!

Likewise, you can draw a perpendicular line using a similar method.

Using a Ruler and Compass

You can also do those with a Ruler and Compass ... see Geometric Constructions.

 

Using a Ruler and Compass Geometric Constructions Using a Protractor Parallel and Perpendicular Geometry Index