Table of Contents

## Definition

When two lines are crossed by another line (** Transversal**):

Alternate Interior Angles are a pair of angles on the inner side of each of those 2 lines but on opposite sides of the transversal.

Example

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

c and e

And

d and f

## How To remember:

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

## Parallel Lines

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