### Learn math, science, English SAT & ACT from

high-quaility study
videos by expert teachers

##### Thank you for watching the preview.

To unlock all 5,300 videos, start your free trial.

# Alternate Exterior 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

Alternate exterior angles are formed by a transversal intersecting two parallel lines . They are located "outside" the two parallel lines but on opposite sides of the transversal, creating two pairs (four total angles) of **alternate exterior angles**. Alternate exterior angles are congruent, meaning they have equal measure.

If we have two parallel lines and again I know parallel lines because they have the same number of arrows. And they're intersected by a transversal, then these angles on the outside that are on opposite sides of this transversal will also be congruent.

So angles one and seven are on opposite sides of the transversal and they're on the exterior part of the of the parallel lines. So if we're going to say, is if you have two parallel lines intersected by a transversal then alternate exterior angles are congruent. So alternate, exterior angles are congruent, so one and seven are going to be congruent and angle eight and two which is on the opposite side are also going to be congruent.

So alternate meaning on different sides of the transversal exterior meaning on the outer part of the parallel lines.

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.

##### Concept (1)

##### Sample Problems (2)

Need help with a problem?

Watch expert teachers solve similar problems.

## Comments (0)

Please Sign in or Sign up to add your comment.

## ·

Delete