##### Like what you saw?

##### Create FREE Account and:

- Watch all FREE content in 21 subjects(388 videos for 23 hours)
- FREE advice on how to get better grades at school from an expert
- Attend and watch FREE live webinar on useful topics

# Adjacent Angles - Concept

###### Brian McCall

###### Brian McCall

**Univ. of Wisconsin**

J.D. Univ. of Wisconsin Law school

Brian was a geometry teacher through the Teach for America program and started the geometry program at his school

Adjacent angles share a side and a vertex. If angles only share a side but not a vertex, they are not adjacent. **Adjacent angles** can also be described as "next to" or "side-by-side" angles.

A word we use often in Geometry is this word Adjacent. You're going to use it in the beginning parts of Geometry and then once you get on Trigonometry as well. We'll hold of on adjacent sides for Trigonometry. But for now the key parts of an adjacent angle that they share a vertex, again the vertex is this point right here I'm going to draw a red dot. So this right here is a vertex. They have a side in common which sets them apart from vertical angles. So the side that these two angles share is that ray right there. So I could say that this angle one and two are adjacent because they share a vertex and they have a side in common. Now if you've been really technical, these two have to be coplanar which means that they're on the same plane.

So if I look at this triangle right here where I've drawn in a line segment we only have two adjacent angles. I'm going to write these as 3 and 4. These two angles right here I'll circle them, are not adjacent because they do not share vertex. So you can think of adjacent as kind of a word for next to.

Please enter your name.

Are you sure you want to delete this comment?

###### Brian McCall

B.S. in Chemical Engineering, University of Wisconsin

J.D. University of Wisconsin Law School (magna cum laude)

He doesn't beat around the bush. His straightforward teaching style is effective and his subtle midwestern accent is engaging. There's never a dull moment with him.

so my teacher can't explain this in 5 weeks but I learn this in less than 3 minutes”

its hard to focus when the teacher is really really really goodlooking”

i like how it took you 3 minutes and 8 seconds to accomplish what my teacher couldn't in 3 days”

##### Concept (1)

##### Sample Problems (1)

Need help with a problem?

Watch expert teachers solve similar problems.

## Comments (4)

Please Sign in or Sign up to add your comment.

## ·

Delete

## saba mahmoud · 1 week, 1 day ago

:)

## saba mahmoud · 1 week, 1 day ago

thanks but next time make it little bit slow when you talk but i love it

## jeremy · 2 months ago

I would of been lost without this website :)

## jeremy · 2 months ago

Thx you helped me out with my project a lot thx :)