### 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 - Problem 1

###### 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 two parallel lines intersected by a transversal. These angles are found on the outside (exterior) of the parallel lines, i.e., they are not in between these two lines, and on opposite sides of the transversal. Alternate exterior angles are congruent. So, if there are two parallel lines and another line, the transversal, that crosses them, you can identify the outer angles that have the same measure.

In this problem we’re taking a fairly simple look at how can we apply alternate exterior angles. We have two parallel lines that are intersected by a transversal. If you notice x and 135 degrees are on opposite sides of this transversal and they’re on the exterior part of the two parallel lines which makes them alternate exterior angles which are always congruent, so x and 135 are the same number, so x is 135 degrees.

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