Alternate exterior angles are a pair of angles formed when a transversal crosses two parallel lines. These angles are positioned on opposite sides of the transversal and lie outside the two parallel lines.

### Properties of Alternate Exterior Angles:
1. **Congruent**: Alternate exterior angles are always equal (congruent) when the lines are parallel.
2. **Position**: They are located on opposite sides of the transversal, but outside the parallel lines.

### Example:
In the diagram below, assume lines \( l_1 \) and \( l_2 \) are parallel, and \( t \) is the transversal:

\[
l_1 \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, t
\]

Angles \( \angle 1 \) and \( \angle 2 \) would be alternate exterior angles. If lines \( l_1 \) and \( l_2 \) are parallel, then:

\[
\angle 1 = \angle 2
\]

This congruence property is a result of the parallel nature of the lines and the fact that the transversal cuts across them.

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### Related Questions:
1. What is the difference between alternate interior and alternate exterior angles?
2. How can you prove that alternate exterior angles are congruent?
3. How do you find the measurement of alternate exterior angles in real-world problems?
4. Can alternate exterior angles be supplementary?
5. How does the transversal affect the properties of alternate angles?

**Tip**: Remember that alternate exterior angles only have this congruent property when the lines they cross are parallel!

Learn about alternate exterior angles formed by a transversal intersecting two parallel lines. Discover their properties, congruence, and how they differ from other angle types. Suitable for students in Grades 7-10, this guide provides examples and tips for mastering geometry concepts.

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