## alternate interior angles

### must have parallel lines; make a Z

Alternate interior angles are angles that are formed inside a pair of parallel lines when a transversal line intersects them. The term “alternate” refers to the fact that the angles are on opposite sides of the transversal and “interior” indicates that they are inside the parallel lines.

If you imagine two parallel lines, such as l and m, and a transversal line, such as n, intersecting them, alternate interior angles can be identified as the pairs of angles that are located on the inner side of the parallel lines and on opposite sides of the transversal.

The key property of alternate interior angles is that they are congruent, meaning they have the same measure. This property holds true regardless of the specific pair of parallel lines and transversal being considered. In other words, if angle 1 and angle 2 are alternate interior angles, then they are equal in measure.

Alternate interior angles play an important role in many mathematical concepts, particularly in the study of parallel lines and their properties. They can be used to solve problems involving missing angle measures, to establish geometric relationships, or to prove theorems.

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