Parallel and Perpendicular Lines

Perpendicular lines are lines that intersect at right angles. The shortest distance from a line to a point not on the line is a perpendicular segment from the point to the line. Parallel lines are lines in the same plane that have no points in common and never meet. It is possible for lines to be in different planes, have no points in common, and never meet, but they are not parallel because they are in different planes.


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Hey guys! Welcome to this video on Parallel and Perpendicular lines.

Lines are everywhere you look. Lines are formed on ceilings in classrooms, bedrooms, or whatever room you’re in. Lines are on the roads we drive on, lines are on the signs we read, the paper we write on, lines are EVERYWHERE.

But understanding, and being able to identify what type of lines they are is a very important tool in the world. Architects and Engineers, (people who design buildings) need to know the types of lines so that they can build buildings that are safe, strong, stable, and won’t randomly fall down on all the people inside.

Now, let’s take a look at two of the most important types of lines: Parallel and perpendicular lines.

Parallel lines are lines that run alongside each other but never intersect or cross with each other. Train tracks form parallel lines. The white lines on both sides of the road are parallel lines.

Perpendicular lines are lines that do cross, and when they do cross they always form right angles. Right angles are angles with a 90 degree angle. Perpendicular lines are formed in ceiling corners, desk corners, or really any corner with a 90 degree, or right, angle.

Let’s look at some examples.

Are these lines Parallel or Perpendicular?
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Perpendicular, because the lines intersect and form a 90 degree angle, or right, angle.

Now, what type of lines are these?

These lines are parallel. See how they run alongside each other, but never intersect?

Let’s try another. Are these lines parallel or perpendicular?

Neither, because even though the lines cross they do not form right angles. You guys are doing great. Sometimes learning can be tough, but you just have to keep trying.

A useful way to help you identify the different types is to look at your definition each time until you’re comfortable with these concepts. If the lines do something the definition says they cannot, or if they do not have something that the definition requires, then you can more easily identify the lines.

I hope this was helpful. To check out more of our videos please subscribe! See you next time!


Provided by: Mometrix Test Preparation

Last updated: 01/25/2018
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