Alternate Exterior Angles


When 2 lines are crossed by another line (Transversal):

Alternate Exterior Angles are a pair of angles on the outer side of each of those two lines but on opposite sides of the transversal.


Alternate Exterior Angles

In this example, these are two pairs of Alternate Exterior Angles:

a and g


b and h

How to remember

the angle pairs are on Alternate sides of the Transversal, and they are on the Exterior of the two crossed lines.

Parallel Lines

When the two lines being crossed are Parallel Lines the Alternate Exterior Angles are equal.

Learn More

Alternate Interior Angles

Consecutive Interior Angles

Vertical Angles

Angles of Elevation & Depression

Geometry Index